Mana Samchaiyaphum (; born September 22, 1992), known professionally as Manasak Sor.Jor.Lekmuangnon (), is a Thai Muay Thai fighter.
Manasak started training in Muay Thai at the age of 10 with his father who used to compete under the name Chaiyaphum Sor.Chitlada.
On January 29, 2009, Manasak defeated Kiatchai Petchnongki by decision at the Rajadamnern Stadium for the Petchthongkam promotion.
On May 6, 2009, Manasak defeated Kongnakornban Sor.Kitrungroj by decision at the Rajadamnern Stadium for the Petchthongkam promotion.
On June 19, 2015, Manasak travelled to France to face Bobo Sacko at the Best of Siam VI event. He lost the fight by decision.
On October 13, 2015, Manasak faced Rittewada Sitthikul at the Lumpinee Stadium for the Phumphanmuang promotion. He lost the fight by decision.
On September 9, 2015, Manasak defeated Singdam Kiatmuu9 by decision in the Rajadamnern Stadium for the Wanmeechai promotion.
Manasak faced Rittewada Sitthikul in the Buriram province on January 22, 2016. He won the fight by referee stoppage in the last round of the fight.
On February 12, 2016, Manasak faced Saensatharn P.K. Saenchai Muaythaigym at the Lumpinee Stadium for the Petchkiatpetch promotion. He won the fight by third round knockout with an elbow.
On August 30, 2016, Manasak faced Saensatharn P.K. Saenchai Muaythaigym for the Thailand 147 lbs title in the Lumpinee Stadium under the Kiatpetch promotion. He won the fight by decision.
On April 29, 2017 Manasak faced Chadd Collins at THAI FIGHT Samui 2017. He won the fight by decision.
On September 7, 2017, Manasak faced Mason Goodwin at Samui Fight. He won the fight by technical knockout in the second round.
On March 8, 2018, Manasak lost by decision to Petchmorakot Wor.Sangprapai at the Rajadamnern Stadium.
|- style="background:#fbb;" | 2018-03-08 || Loss ||align=left| Petchmorakot Wor.Sangprapai || Rajadamnern Stadium || Bangkok, Thailand || Decision || 5 || 3:00
|- style="background:#fbb;" | 2017-11-09|| Loss ||align=left| Petchmorakot Wor.Sangprapai || Rajadamnern Stadium || Bangkok, Thailand || Decision || 5 || 3:00
|- style="background:#cfc;" | 2017-09-07|| Win ||align=left| Damon Goodwin || Samui Fight || Ko Samui, Thailand || TKO (Knees) || 2 ||
|- style="background:#cfc;" | 2017-04-29|| Win ||align=left| Chadd Collins || THAI FIGHT Samui 2017 || Ko Samui, Thailand || Decision || 3 || 3:00
|- style="background:#cfc;" | 2016-12-09 || Win ||align=left| Petchmorakot Wor.Sangprapai || Lumpinee Stadium 60th Anniversary || Bangkok, Thailand || Decision || 5 || 3:00
|- style="background:#cfc;" | 2016-10-06 || Win ||align=left| Petchmorakot Wor.Sangprapai || Wanmeechai, Rajadamnern Stadium || Bangkok, Thailand || Decision || 5 || 3:00
|- style="background:#cfc;" | 2016-08-30|| Win ||align=left| Saensatharn P.K. Saenchai Muaythaigym || Kiatpetch, Lumpinee Stadium || Bangkok, Thailand || Decision || 5 || 3:00 |- ! style=background:white colspan=9 |
|- style="background:#cfc;" | 2016-07-01 || Win ||align=left| Rittewada Sitthikul || 80th Anniversary Commemoration Stadium || Nakhon Ratchasima, Thailand || Decision || 5 || 3:00
|- style="background:#fbb;" | 2016-03-29|| Loss ||align=left| Yodwicha Por.Boonsit || Kiatpetch, Lumpini Stadium || Bangkok, Thailand || Decision || 5 || 3:00
|- style="background:#cfc;" | 2016-02-12 || Win ||align=left| Saensatharn P.K. Saenchai Muaythaigym || Petchkiatpetch, Lumpinee Stadium || Bangkok, Thailand || KO (Elbow)|| 3 ||
|- style="background:#cfc;" | 2016-01-22 || Win ||align=left| Rittewada Sitthikul || || Buriram, Thailand || TKO (Referee stoppage) || 5 ||
|- style="background:#cfc;" | 2015-11-21 || Win ||align=left| Satanfah Rachanon || || Uthai Thani, Thailand || Decision || 5 || 3:00
|- style="background:#fbb;" | 2015-10-13|| Loss ||align=left| Rittewada Sitthikul || Phumphanmuang, Lumpinee Stadium || Bangkok, Thailand || Decision || 5 || 3:00
|- style="background:#cfc;" | 2015-09-09 || Win ||align=left| Singdam Kiatmuu9 || Wanmeechai, Rajadamnern Stadium || Bangkok, Thailand || Decision || 5 || 3:00
|- style="background:#cfc;" | 2015-08-02|| Win ||align=left| Simanut Sor.Sarinya || Channel 7 Stadium || Bangkok, Thailand || Decision || 5 || 3:00
|- bgcolor="#fbb" | 2015-06-18|| Loss ||align=left| Bobo Sacko || Best Of Siam 6 || Tours, France || Decision (Unanimous) || 5 || 3:00
|- style="background:#fbb;" | 2015-04-29|| Loss ||align=left| Saensatharn P.K. Saenchai Muaythaigym || Jitmuangnon, Rajadamnern Stadium || Bangkok, Thailand || Decision || 5 || 3:00
|- style="background:#cfc;" | 2015-03-06 || Win ||align=left| Singdam Kiatmuu9 || Lumpini Champion Krikkrai, Lumpinee Stadium || Bangkok, Thailand || TKO (Punch) || 4 ||
|- style="background:#cfc;" | 2015-01-25 || Win||align=left| PTT Petchrungruang|| Rajadamnern Super Fight PPTV, Rajadamnern Stadium || Bangkok, Thailand || Decision || 5 || 3:00
|- style="background:#cfc;" | 2014-11-30|| Win ||align=left| Diesellek Uddonmuang || Rajadamnern Stadium || Bangkok, Thailand || Decision || 5 ||3:00
|- style="background:#cfc;" | 2014-10-06 || Win ||align=left| Chok Sagami || Petchaophraya, Rajadamnern Stadium || Bangkok, Thailand || Decision || 5 || 3:00
|- style="background:#cfc;" | 2013-12-21 || Win ||align=left| Saensatharn P.K. Saenchai Muaythaigym || Omnoi Stadium, Weber Tournament || Samut Sakhon, Thailand || KO (Low kicks)|| 3 ||
|- style="background:#cfc;" | 2013-09-20 || Win ||align=left| Kriangkrai Tor.Silachai || OneSongchai || Yasothon province, Thailand || Decision || 5 || 3:00
|- style="background:#fbb;" | 2013-06-01 || Loss||align=left| Saensatharn P.K. Saenchai Muaythaigym || Omnoi Stadium || Samut Sakhon, Thailand || Decision || 5 || 3:00
|- style="background:#fbb;" | 2013-04-12 || Loss ||align=left| Yodpayak Sitsongpeenong || || Nakhon Ratchasima, Thailand || Decision || 5 || 3:00
|- style="background:#fbb;" | 2012-11-16 || Loss||align=left| Saensatharn P.K. Saenchai Muaythaigym || Paironan, Lumpinee Stadium || Bangkok, Thailand || KO (Left Knee) || 3 ||
|- style="background:#cfc;" | 2012-08-18 || Win ||align=left| Tuanthong Pumpanmuang || Por.Petchkaikaew Gym || Hua Hin district, Thailand || Decision || 5 || 3:00
|- style="background:#fbb;" | 2011-09-19|| Loss ||align=left| Kupee Kiatyongyut|| Kiatyongyut, Rajadamnern Stadium || Bangkok, Thailand || KO || 1 ||
|- style="background:#fbb;" | 2011-07-23 || Loss ||align=left| Berneung TopkingBoxing || Thailand vs Challenger 2011 || Bangkok, Thailand || KO (Left Uppercut) || 2 ||
|- style="background:#fbb;" | 2010-09-16|| Loss||align=left| Kongnakornban Sor.Kitrungroj || Palangnum, Rajadamnern Stadium || Bangkok, Thailand || KO || 4 ||
|- style="background:#fbb;" | 2010-08-04|| Loss||align=left| Sittisak Petpayathai|| Rajadamnern Stadium || Bangkok, Thailand || KO || 4 ||
|- style="background:#cfc;" | 2010-06-10 || Win ||align=left| Mongkolchai Kwaitonggym || OneSongchai, Rajadamnern Stadium || Bangkok, Thailand || KO || 3 ||
|- style="background:#fbb;" | 2010-01-13|| Loss||align=left| Singtongnoi Por.Telakun || Onesongchai NBT, Rajadamnern Stadium || Bangkok, Thailand || KO || 3 ||
|- style="text-align:center; background:#fbb;" | 2009-10-08 || Loss||align=left| Singtongnoi Por.Telakun || Palangnum, Rajadamnern Stadium || Bangkok, Thailand || Decision || 5 || 3:00
|- style="background:#c5d2ea;" | 2009-09-10 || Draw||align=left| Pettawee Sor Kittichai || Phettongkam, Rajadamnern Stadium || Bangkok, Thailand || Decision || 5 || 3:00
|- style="background:#cfc;" | 2009-08-06 || Win ||align=left| Pornsanae Sitmonchai || Raja vs Lumpinee, Rajadamnern Stadium || Bangkok, Thailand || Decision || 5 || 3:00
|- style="background:#cfc;" | 2009-06-27 || Win ||align=left| Phet-Ek Sitjaopho || Omnoi Stadium || Samut Sakhon, Thailand || Decision || 5 || 3:00
|- style="background:#cfc;" | 2009-05-06 || Win ||align=left| Kongnakornban Sor.Kitrungroj || Petchthongkam, Rajadamnern Stadium || Bangkok, Thailand || Decision || 5 || 3:00
|- style="background:#cfc;" | 2009-03-11 || Win ||align=left| Nueangjakkawan Sor.Suwannee || Phettongkham, Rajadamnern Stadium || Bangkok, Thailand || Decision || 5 || 3:00
|- style="background:#cfc;" | 2009-01-26 || Win ||align=left| Kiatchai Petchnongki || Petchthongkam, Rajadamnern Stadium || Bangkok, Thailand || Decision || 5 || 3:00
|- style="background:#cfc;" | 2008-05-29 || Win ||align=left| Yod Sor.Ploechit || Onesongchai, Rajadamnern Stadium || Bangkok, Thailand || Decision || 5 || 3:00 |- | colspan=9 | Legend:
|- style="background:#fbb;" | 2017-09-21 || Loss ||align=left| Mustafa Saparmyradow || 2017 Asian Indoor and Martial Arts Games, Final || Ashgabat, Turkmenistan || Decision (30:27) || 3 || 3:00 |- ! style=background:white colspan=9 |
|- style="background:#cfc;" | 2017-09-20 || Win ||align=left| Reza Ahmadnejad || 2017 Asian Indoor and Martial Arts Games, Semifinals || Ashgabat, Turkmenistan || Decision (30:27) || 3 || 3:00
|- style="background:#cfc;" | 2017-09-19 || Win ||align=left| Nikolay Samussev || 2017 Asian Indoor and Martial Arts Games, Quarterfinals || Ashgabat, Turkmenistan || Decision (30:27) || 3 || 3:00
|- style="background:#cfc;" | 2017-09-18 || Win ||align=left| Akram Hasan || 2017 Asian Indoor and Martial Arts Games, First Round || Ashgabat, Turkmenistan || Decision (30:27) || 3 || 3:00
|- style="background:#cfc;" | 2017-08-29 || Win||align=left| Tengku Sharizal Abd Rahman|| 2017 SEA Games Muay Thai Tournamaent, Final||Kuala Lumpur, Malaysia || Decision (30:27) || 3 ||3:00 |- ! style=background:white colspan=9 |
|- style="background:#cfc;" | 2017-08-28 || Win ||align=left| || 2017 SEA Games Muay Thai Tournamaent, Semifinals || Kuala Lumpur, Malaysia || || ||
|- style="background:#fbb;" | 2017-05-12 || Loss ||align=left| Dmitry Varats || 2017 IFMA World Championships, Final || Minsk, Belarus || RSCB|| 3 || |- ! style=background:white colspan=9 |
|- style="background:#cfc;" | 2017-05-10|| Win || align="left" | Magomed Zaynukov || IFMA World Championships 2017, Semifinals || Minsk, Belarus || Decision (29:28) || 3 || 3:00
|- | colspan=9 | Legend: