Nicolaas Hubertus Holzken (born December 16, 1983) is a Dutch retired kickboxer and professional boxer. He is the former Glory Welterweight Champion. In 2018, Holzken participated in the World Boxing Super Series as a substitute.
After his parents separated when he was an infant, Holzken was raised by his paternal grandparents. Inspired by martial arts movies, he started training kickboxing at the age of ten.
Nieky Holzken made his K-1 debut on November 26, 2006, at K-1 World MAX North European Qualification in Stockholm, Sweden. He won the tournament by three consecutive KO's over Björn Kjöllerström, Joakim Karlsson and Elias Daniel. The win qualified him for the K-1 World MAX 2007 Final Elimination, where he was matched up against the reigning K-1 MAX champion Buakaw Por. Pramuk. He lost the fight by unanimous decision.
He faced Murat Direkçi at ' on October 6, 2012, in Brussels, Belgium and won via TKO due to a cut in the second round.
He defeated Karim Ghajji via TKO due to a cut in an extension round at ' in Istanbul, Turkey on April 6, 2013.
He was to fight at SLAMM!! - Soema na Basi IV: Londt vs. Adegbuyi in Paramaribo, Suriname on August 8, 2013 but withdrew for undisclosed reasons.
He was initially scheduled to fight Marc de Bonte in the ' semi-finals in Tokyo, Japan on December 21, 2013 but his opponent was then changed to Karapet Karapetyan who he had previously fought and beat in February 2012 by decision. He knocked Karapetyan down in rounds one and two en route to a clear unanimous decision win before facing Joseph Valtellini in the final. In a back-and-forth fight where both pressed forward, landing powerful but technical punches and kicks, Holzken scored a TKO in the dying seconds of the third and final round to be crowned the inaugural Glory World Welterweight (-77.1 kg/170 lb) Tournament Champion.
He was set to fight for the inaugural Glory Welterweight Championship against Marc de Bonte at ' in Zagreb, Croatia on March 8, 2014 but the fight was cancelled when he suffered a shoulder injury in a car accident. The match was rescheduled for ' in Broomfield, Colorado, US on May 3, 2014 but his lingering shoulder injury again forced him out, and he was replaced by Karapet Karapetyan.
On February 6, 2015, Holzken was part of a one-night, four-man at Glory 19 to determine who would get the next title shot. In the semifinals, he faced Alexander Stetsurenko and won via unanimous decision. In the finals, he faced Raymond Daniels and won via TKO in the third round.
On April 16, 2016, he defeated Yoann Kongolo. After the match-up Holzken expressed his desire to in-ring commentator Joseph Valtellini that he wished to face him again.
On July 2, 2018, Holzken announced on his social media that he had rejected a contract offer from Glory and was entertaining offers from other promotions.
Since 2013, Holzken had competed in professional boxing alongside his kickboxing career, but in February 2018 he got the biggest opportunity in the sport when he stepped in at late notice to face Callum Smith in the World Boxing Super Series super-middleweight tournament. The Dutchman was 13-0 coming in, and Smith 23-0. Smith took the win by unanimous decision, and then went on to knockout George Groves in the final.
Holzken returned to kickboxing when he signed for ONE Championship, making his debut with a second round KO over Cosmo Alexandre at ' in November 2018.
He would challenge Regian Eersel for the inaugural ONE Lightweight Kickboxing World Championship at ' in May 2019 and lose via unanimous decision. The two would rematch for the title in October 2019 at ', but Holzken lost again via unanimous decision.
It was announced that Nieky Holzken would face Elliot Compton at ' on December 11, 2020. It was also revealed that Holzken had signed a six-fight contract extension with ONE after his original contract expired. Holzken knocked Compton out in the first round, with a liver shot.
Holzken faced John Wayne Parr in a Muay Thai bout at ONE on TNT 3 on April 21, 2021. He won the bout via TKO after dropping Parr with a head kick in the second round. A mere fortnight after the bout Holzken announced that his contract had expired and he became a free agent.
On September 13, 2021, Holzken announced that he had signed a new multi-fight contract with ONE Championship.
In November 2021, Combat Press ranked him as the #5 welterweight kickboxer in the world.
As the first fight of his new six-fight contract, Holzken was scheduled to face the one-time ONE Lightweight Kickboxing title challenger Islam Murtazaev at ' on March 26, 2022. With the removal of all Russian athletes from the event as a result of the 2022 Russian invasion of Ukraine, Murtazaev was replaced by Sinsamut Klinmee and the fight was changed to Muay Thai rules. He lost the fight by a second-round knockout.
Holzken was scheduled to face Islam Murtazaev at ONE 162 on October 21, 2022. However, Holzken withdrew with an injury on four days before the bout was supposed to take place.
Holzken faced Arian SadikoviÃÂ at ONE Fight Night 11 on June 10, 2023. At the weigh-ins, Holzken weighed in at 176 pounds, 6 pounds over the lightweight limit. As a result, the bout proceeded as a catchweight and Holzken was fined 30% of his fight purse, which went to SadikoviÃÂ. He lost the fight by unanimous decision.
Holzken faced Yoshihiro Akiyama in a special-rules bout at ONE 165 on January 28, 2024. The match, contested in MMA gloves, will be three rounds: the first round being boxing rules, the second round being Muay Thai rules, and the third round being MMA rules. Holzken won the fight by technical knockout in the first round. This win earned the $50,000 Performance of the Night awards.
On March 14th 2025, Holzken faced Sinsamut Klinmee in a highly anticipated rematch. Holzken won the fight by a 1st round knock-out after being knocked down himself only moments before. This win earned him another $50,000 Performance Bonus.
On February 8th, 2026, Holzken announced he was retiring from competition.
Holzken's family and in-laws are "woonwagenbewoners", indigenous Dutch Travellers.
Holzken and his wife Nathelie have a son and a daughter.
|- style="background:#cfc;" | 2025-03-14 || Win ||align=left| Sinsamut Klinmee || ONE Friday Fights 100 || Bangkok, Thailand || KO (Right hook) || 1 || 1:58 || 95-18-0
|- style="background:#fbb;" | 2023-06-10 || Loss ||align=left| Arian SadikoviÃÂ || ONE Fight Night 11 || Bangkok, Thailand || Decision (Unanimous) || 3 || 3:00 || 94-18-0
|- style="background:#fbb;" | 2022-03-26|| Loss ||align=left| Sinsamut Klinmee || || Kallang, Singapore || KO (Punch) || 2 || 1:39 || 94-17-0
|- style="background:#cfc;" | 2021-04-21 || Win || align="left" | John Wayne Parr || ONE on TNT 3 || Kallang, Singapore || TKO (head kick) || 2 || 1:23 || 94-16-0 |- |- style="background:#cfc;" | 2020-12-11 || Win || align="left" | Elliot Compton || || Kallang, Singapore || KO (liver punch) || 1 || 1:36 || 93-16-0 |- |- style="background:#fbb;" | 2019-10-26||Loss ||align=left| Regian Eersel || | || Jakarta, Indonesia || Decision (Unanimous) || 5 || 3:00 || 92-16-0 |- ! style=background:white colspan=9 | |- |- style="background:#fbb;" | 2019-05-17 || Loss || align="left" | Regian Eersel || | || Kallang, Singapore || Decision (Unanimous) || 5 || 3:00 || 92-15-0 |- ! style=background:white colspan=9 | |- |- |- style="background:#cfc;" | 2019-02-22 || Win || align="left" | Mustapha Haida || || Kallang, Singapore || Decision (Unanimous) || 3 || 3:00 || 92-14-0 |- |- style="background:#cfc;" | 2018-11-17 || Win || align="left" | Cosmo Alexandre || || Jakarta, Indonesia || KO (uppercut) || 2 || 2:59 || 91-14-0 |- |- style="background:#fbb;" | 2017-12-09 || Loss ||align=left| Alim Nabiev || || Rotterdam, Netherlands || Decision (Unanimous) || 3 || 3:00 || 90-14-0 |- |- style="background:#fbb;" | 2017-06-10 || Loss ||align=left| Cédric Doumbé || Glory 42: Paris || Paris, France || Decision (split) || 5 || 3:00 || 90-13-0 |- ! style=background:white colspan=9 | |- |- style="background:#fbb;" | 2016-12-10 || Loss ||align=left| Cédric Doumbé || || Oberhausen, Germany || Decision (split) || 5 || 3:00 || 90-12-0 |- ! style=background:white colspan=9 | |- |- style="background:#cfc;" | 2016-10-21 || Win ||align=left| Murthel Groenhart || || Broomfield, Colorado || Decision (unanimous) || 5 || 3:00 || 90-11-0 |- ! style=background:white colspan=9 | |- style="background:#cfc;" | 2016-04-16 || Win ||align=left| Yoann Kongolo || || Copenhagen, Denmark || Decision (unanimous) || 5 || 3:00 || 88-11-0 |- ! style=background:white colspan=9 | |- style="background:#cfc;" | 2015-12-04 || Win ||align=left| Murthel Groenhart || || Amsterdam, Netherlands || Decision (split) || 5 || 3:00 || 87-11-0 |- ! style=background:white colspan=9 | |- style="background:#cfc;" | 2015-08-07 || Win ||align=left| Raymond Daniels || || Las Vegas, Nevada, USA || TKO (right knee cut) || 3 || 1:36 || 86-11-0 |- ! style=background:white colspan=9 | |- style="background:#cfc;" | 2015-02-06 || Win ||align=left| Raymond Daniels || || Hampton, Virginia, USA || TKO (4 Knockdowns) || 3 || 1:25 || 85-11-0 |- ! style=background:white colspan=9 | |- style="background:#cfc;" | 2015-02-06 || Win ||align=left| Alexander Stetsurenko || || Hampton, Virginia, USA || Decision (unanimous) || 3 || 3:00 || 84-11-0 |- ! style=background:white colspan=9 | |- style="background:#cfc;" | 2014-12-25 || Win ||align=left| Yusuf Karakaya || One Shot World Series || Antalya, Turkey || TKO (Referee Stoppage) || 1 || 2:05 || 83-11-0 |- style="background:#cfc;" | 2013-12-21 || Win ||align=left| Joseph Valtellini || || Tokyo, Japan || TKO (right hook) || 3 || 3:00 || 82-11-0 |- ! style=background:white colspan=9 | |- style="background:#cfc;" | 2013-12-21 || Win ||align=left| Karapet Karapetyan || || Tokyo, Japan || Decision (unanimous) || 3 || 3:00 || 81-11-0 |- ! style=background:white colspan=9 | |- style="background:#cfc;" | 2013-04-06 || Win ||align=left| Karim Ghajji || || Istanbul, Turkey || TKO (cut) || 4 || || 80-11-0 |- style="background:#cfc;" | 2012-10-06 || Win ||align=left| Murat Direkçi || || Brussels, Belgium || TKO (cut) || 2 || || 79-11-0 |- style="background:#fbb;" | 2012-09-02 || Loss ||align=left| L'houcine Ouzgni || Muay Thai Mania V || The Hague, Netherlands || Extra R. Decision|| 4 || 3:00 || 78-11-0 |- style="background:#cfc;" | 2012-05-26 || Win ||align=left| Alex Tobiasson Harris || || Stockholm, Sweden || TKO (3 knockdowns/liver shots)|| 2 || 2:42 || 78-10-0 |- style="background:#cfc;" | 2012-03-23 || Win ||align=left| Davit Kiria || United Glory 15: World Series 2012 || Moscow, Russia || Decision || 3 || 3:00 || 77-10-0 |- style="background:#cfc;" | 2012-02-12 || Win ||align=left| Karapet Karapetyan || Natural Powers || Eindhoven, Netherlands || Decision || 5 || 3:00 || 76-10-0 |- ! style=background:white colspan=9 | |- style="background:#cfc;" | 2011-12-23 || Win ||align=left| Cyrus Washington || Klaar Om Te Bossen 3 || Paramaribo, Suriname || TKO (Cut) || 2 || || |- style="background:#cfc;" | 2011-11-06 || Win ||align=left| Ky Hollenbeck || Muay Thai Premier League: Round 3 || The Hague, Netherlands || Decision (Unanimous) || 3 || 3:00 || |- style="background:#cfc;" | 2011-09-02 || Win ||align=left| Marco Piqué || Muaythai Premier League: Round 1 || Long Beach, California, USA || Decision || 3 || 3:00 || |- style="background:#fbb;" | 2011-05-28 || Loss ||align=left| Artur Kyshenko || United Glory 14: 2010-2011 World Series Finals || Moscow, Russia || Decision (Unanimous) || 3 || 3:00 || |- style="background:#cfc;" | 2011-03-19 || Win ||align=left| Carlos Tavares || United Glory 13: 2010-2011 World Series Semifinals || Charleroi, Belgium || KO (Punches) || 1 || 2:04 || |- style="background:#cfc;" | 2011-02-27 || Win ||align=left| Thilo Schneider || Kickboxgala Golden Glory Helmond, Sporthal Haagdijk || Eindhoven, Netherlands || TKO (Corner stoppage) || 2 || 3:00 || |- ! style=background:white colspan=9 | |- style="background:#cfc;" | 2010-10-16 || Win ||align=left| Murthel Groenhart || United Glory 12: 2010-2011 World Series Quarterfinals || Amsterdam, Netherlands || Ext. R Decision || 4 || 3:00 || |- style="background:#fbb;" | 2010-09-12 || Loss ||align=left| L'houcine Ouzgni || || Amsterdam, Netherlands || KO (Left flying knee) || 1 || 0:53 || |- style="background:#cfc;" | 2010-06-19 ||Win ||align=left| Cagri Ermis || A1 World Combat Cup || Eindhoven, Netherlands || Decision || 3 || 3:00 || |- style="background:#cfc;" | 2010-05-29 ||Win ||align=left| Cosmo Alexandre || It's Showtime 2010 Amsterdam || Amsterdam, Netherlands || Decision (4-1) || 3 ||3:00 || |- style="background:#cfc;" | 2010-04-10 || Win ||align=left| Mourad Salhi || Star Muaythai V || Maastricht, Netherlands || Ext R. Decision || 4 || 3:00 || |- style="background:#cfc;" | 2010-01-30 || Win ||align=left| Leroy Kaestner || Beast of the East || Zutphen, Netherlands || Decision (Unanimous) || 3 || 3:00 || |- style="background:#cfc;" | 2009-12-06 || Win ||align=left| Mohammed Medhar || GGH Gala || Helmond, Netherlands || Decision (Unanimous) || 3 || 3:00 || |- style="background:#cfc;" | 2009-10-17 || Win ||align=left| Faldir Chahbari || || Amsterdam, Netherlands ||Extr R. Decision (Unanimous) || 4 || 3:00 || |- style="background:#fbb;" | 2009-07-13 || Loss ||align=left| Buakaw Por.Pramuk || K-1 World MAX 2009 Final 8 || Tokyo, Japan || Decision (Unanimous) || 3 || 3:00 || |- style="background:#cfc;" | 2009-04-21 || Win ||align=left| Chahid Oulad El Hadj || K-1 World MAX 2009 Final 16 || Fukuoka, Japan || Decision (Majority) || 3 || 3:00 || |- style="background:#cfc;" | 2008-11-30 || Win ||align=left| Marco Pique || SLAMM "Nederland vs Thailand V" || Almere, Netherlands || KO (Left hook) || 3 || 2:56 || |- style="background:#cfc;" | 2008-10-01 || Win ||align=left| Virgil Kalakoda || K-1 World MAX 2008 Final || Tokyo, Japan || KO (Right hook) || 1 || 1:42 || |- style="background:#cfc;" | 2008-07-06 || Win ||align=left| William Diender || Ultimate Glory 9 || Nijmegen, Netherlands || KO (Left body shot) || 4 || 0:47 || |- style="background:#cfc;" | 2008-05-31 || Win ||align=left| José Reis || Beast of the East 2008 || Zutphen, Netherlands || Decision (Unanimous) || 5 || 3:00 || |- style="background:#cfc;" | 2008-04-26 || Win ||align=left| Joerie Mes || K-1 World GP 2008 in Amsterdam || Amsterdam, Netherlands || KO (Spinning back kick) || 2 || 2:21 || |- style="background:#cfc;" | 2008-03-15 || Win ||align=left| Karim El Jouharti || , Super Fight || 's-Hertogenbosch, Netherlands || Decision (Unanimous) || 3 || 3:00 || |- style="background:#fbb;" | 2008-01-26 || Loss ||align=left| Alviar Lima || Beast of the East || Zutphen, Netherlands || KO (Left hook) || 3 || 0:36 || |- ! style=background:white colspan=9 | |- style="background:#fbb;" | 2007-11-24 || Loss ||align=left| Andy Souwer || Shootboxing in the Autotron || Rosmalen, Netherlands || Decision (Unanimous) || 3 || 3:00 || |- style="background:#cfc;" | 2007-10-27 || Win ||align=left| Lamsongkram Chuwattana || SLAMM "One Night in Bangkok" || Antwerp, Belgium || Decision (Unanimous) || 3 || 3:00 || |- style="background:#cfc;" | 2007-09-09 || Win ||align=left| Baker Barakat || Ultimate Glory 5 || Amersfoort, Netherlands || Decision (Unanimous) || 3 || 3:00 || |- style="background:#fbb;" | 2007-06-28 || Loss ||align=left| Buakaw Por. Pramuk || K-1 World MAX 2007 Final Elimination || Tokyo, Japan || Decision (Unanimous) || 3 || 3:00 || |- style="background:#cfc;" | 2007-05-13 || Win ||align=left| Marijn Geuens || Fight Night in Veghel || Veghel, Netherlands || KO (Spinning back kick) || || || |- style="background:#cfc;" | 2007-04-07 || Win ||align=left| Ruslan Kaladko || Balans Fight Night || Tilburg, Netherlands || Decision (Unanimous) || 3 || 3:00 || |- style="background:#cfc;" | 2007-01-21 || Win ||align=left| Steve Neumann || Ultimate Glory 2 || Amersfoort, Netherlands || KO (Left uppercut) || 1 || || |- style="background:#cfc;" | 2006-11-24 || Win ||align=left| Elias Daniel || K-1 World MAX North European Qualification 2007 || Stockholm, Sweden || KO (Left body shot) || 3 || 0:50 || |- ! style=background:white colspan=9 | |- style="background:#cfc;" | 2006-11-24 || Win ||align=left| Joakim Karlsson || K-1 World MAX North European Qualification 2007 || Stockholm, Sweden || KO (Straight right punch) || 1 || 0:34 || |- style="background:#cfc;" | 2006-11-24 || Win ||align=left| Björn Kjöllerström || K-1 World MAX North European Qualification 2007 || Stockholm, Sweden || KO (Right hook) || 1 || 2:20 || |- style="background:#cfc;" | 2006-09-23 || Win ||align=left| Jan van Denderen || It's Showtime 75MAX Trophy Final 2006, Reserve Fight || Rotterdam, Netherlands || Decision (Unanimous) || 3 || 3:00 || |- style="background:#cfc;" | 2006-03-26 || Win ||align=left| Terence Oosterling || West Point Fight II || Tilburg, Netherlands || KO (Left cross) || 1 || 0:10 || |- style="background:#cfc;" | 2006-03-05 || Win ||align=left| Travers Schlee || Future Battle || Bergen op Zoom, Netherlands || TKO || || || |- style="background:#cfc;" | 2005-12-17 || Win ||align=left| Ferhat Atasoy || WFCA Gala "The Eye of the Tiger" || Arnhem, Netherlands || KO || || || |- style="background:#fbb;" | 2005-10-30 || Loss ||align=left| Donald Berner || It's Showtime 75MAX Trophy Alkmaar, Pool B Semi Finals || Alkmaar, Netherlands || Ext R. Decision (Unanimous) || 4 || 3:00 || |- style="background:#cfc;" | 2005-09-25 || Win ||align=left| Daniel Hudson || || Manchester, England || KO (Straight right punch) || 1 || 1:01 || |- ! style=background:white colspan=9 | |- style="background:#cfc;" | 2005-06-18 || Win ||align=left| Melvin van Leeuwaarde || Showdome IV || Amsterdam, Netherlands || KO || || || |- style="background:#cfc;" | 2005-04-30 || Win ||align=left| ÃÂmer Tekin || Queens Fight Night || Eindhoven, Netherlands || TKO (Corner stoppage) || 1 || || |- style="background:#cfc;" | 2005-02-27 || Win ||align=left| Richard Jones || Master Sken's Fight Night || Manchester, England || KO (Straight right punch) || 2 || 1:06 || |- style="background:#cfc;" | 2004-12-12 || Win ||align=left| Servet Cakir || Face to Face 2nd Edition, Final || Apeldoorn, Netherlands || Decision (Unanimous) || 5 || 2:00 || |- ! style=background:white colspan=9 | |- style="background:#cfc;" | 2004-12-12 || Win ||align=left| Felat Atasoy || Face to Face 2nd Edition, Semi Final || Apeldoorn, Netherlands || Decision (Unanimous) || 4 || 2:00 || |- style="background:#cfc;" | 2004-12-12 || Win ||align=left| Radju Ramdjilal || Face to Face 2nd Edition, Quarter Final || Apeldoorn, Netherlands || KO || || || |- style="background:#fbb;" | 2004-09-04 || Loss ||align=left| Henrik Nygaard || Valhalla 2004 Battle of the Vikings || Aarhus, Denmark || KO || 4 || || |- style="background:#cfc;" | 2004-03-27 || Win ||align=left| Steven Berkolayko || WPKL Muay Thai Champions League XIII || Rotterdam, Netherlands || Decision (Unanimous) || 5 || 2:00 || |- style="background:#c5d2ea;" | 2004-02-21 || NC ||align=left| Mesut Acikyol || Test of Talent Reloaded III || Mortsel, Belgium || No contest || 5 || || |- style="background:#cfc;" | 2004-02-20 || Win ||align=left| Richard Jones || Master Sken's Fight Night || Manchester, England || TKO || 4 || || |- style="background:#cfc;" | 2004-02-01 || Win ||align=left| Nico Lombaerts || Thai-Kickboxing Gala || Valkenswaard, Netherlands || KO (Low kicks) || 1 || || |- style="background:#cfc;" | 2003-12-19 || Win ||align=left| Ali Moftagari || Gala in Kampen || Kampen, Netherlands || KO || || || |- style="background:#fbb;" | 2003-06-29 || Loss ||align=left| Frank Sonders || Dutch Muay Thai Championships || Rotterdam, Netherlands || Decision (Unanimous) || 5 || 2:00 || |- style="background:#fbb;" | 2002-11-17 || Loss ||align=left| Wesley Robijn || Jellema promotion, Sporthal "De Wetering" || Houten, Netherlands || KO || || || |- style="background:#cfc;" | 2002-10-06 || Win ||align=left| Dennis Rooy || WFCA Gala in Nijmegen || Nijmegen, Netherlands || Decision (Unanimous) || 2 || 2:00 || |- style="background:#cfc;" | 2002-04-13 || Win ||align=left| Reza Rahimpour || TB Den Haag promotion, Fairtex Thaiboksgala || The Hague, Netherlands || TKO || 2 || || |- | colspan=9 | Legend:
|- |Win |align=center| 1âÂÂ0 |Yoshihiro Akiyama | TKO (punches) |ONE 165 | |align=center| 1 |align=center| 1:40 |Tokyo, Japan |