Kaià  Hiroyuki (born 24 July 1972 as Hiroyuki Koga) is a former professional sumo wrestler from Nà Âgata, Fukuoka, Japan.
He made his debut in 1988, reaching the top makuuchi division in 1993. He held the second highest rank of à Âzeki or champion for eleven years from 2000 to 2011, and is the longest-serving à Âzeki of all time in terms of number of tournaments fought.
In his career, Kaià  won five top division yà «shà  or tournament championships, the last coming in 2004. This is the modern record for someone who has not ultimately made the top rank of yokozuna. He was a runner-up in eleven other tournaments, and also won 15 sanshà  or special prizes, the third highest ever.
In November 2009 he broke the record previously held by Takamiyama for the most tournaments ranked in the top division, and in January 2010 he surpassed Chiyonofuji's record of most top division bouts won. In the May 2010 tournament he became the only wrestler besides Chiyonofuji to reach one thousand career wins, and he surpassed Chiyonofuji's career wins record of 1045 in July 2011. He retired in the same tournament to become a coach at Tomozuna stable under the elder name Asakayama. In 2014, he established the latest incarnation of the Asakayama stable.
Koga did karate for two years in elementary school, and judo in his second year of junior high school. He had not shown much interest in sumo but was asked by his parents to take part in sumo competitions. It was at one such competition in Fukuoka that he was spotted by the wrestler Kaiki, later Tomozuna Oyakata. After being introduced to Kaiki by a common acquaintance in NÃ Âgata, the young Koga was recruited to Tomozuna stable upon graduation from junior high. Kaiki thought so highly of the apprentice that he promised Koga's parents that he would become a sekitori by the age of 20. However, because the move had been set up by others around him, and he had not ever had the ambition to be a rikishi himself, Koga initially had doubts that he would be able to succeed in sumo.
He made his professional debut in March 1988, at the same time as former yokozuna Akebono, Takanohana and Wakanohana, who all made the top division faster than him but who had all retired by 2003. Initially fighting under his own surname, he reached the makushita division in September 1990 after winning the sandanme championship with a perfect 7âÂÂ0 record. He won the makushita tournament in July 1991 and in November 1991, in his hometown tournament in Kyushu, he earned promotion to the sekitori ranksâÂÂa performance he later recalled as one of his most memorable ever. Upon making his debut in second highest jà «ryà  division in January 1992 he adopted the shikona of Kaià Â. After a few injury problems he worked his way up the jà «ryà  division and reached the top makuuchi division for the first time in May 1993. He fell back to jà «ryà  after a 4âÂÂ11 score in his makuuchi debut. This meant that, oddly, he had recorded a make-koshi or losing score in every tournament in which he was debuting in a new division. However, he returned to the top division in November 1993, where he was to remain for the rest of his career. After defeating his first yokozuna and winning his first special prize in March 1994, he was promoted to a san'yaku rank for the first time for the following tournament in May 1994, at komusubi. He made sekiwake rank in January 1995, and came through with a winning record and another prize in his sekiwake debut.
In the earlier part of his top division career Kaià Â's lack of consistency, and injury problems, denied him the major promotion to à Âzeki that his ability merited. He set records for both the number of tournaments spent at sekiwake (21) and for the longest run being consecutively ranked in the junior san'yaku ranks without making à Âzeki (14). He also accumulated a record equalling ten Shukun-shà Â, or Outstanding Performance Prizes. Together with his five Kantà Â-shà Â, or Fighting Spirit awards, he has 15 special prizes in total, placing him third behind Akinoshima and Kotonishiki. He also earned six kinboshi or gold stars for defeating yokozuna when ranked as a maegashira. He twice took part in playoffs for the championship, in November 1996 (with four other wrestlers, won by Musashimaru) and in March 1997 (with three others, won by Takanohana). In May 1997 injuries to his left leg sustained in a match with Takanonami caused him to miss tournaments and took over a year to fully heal. He could not win more than eight bouts in a tourney during 1998, but he was runner-up in two more tournaments in 1999, in May and November.
Kaià  won his first top division tournament championship in May 2000 from the komusubi rank, defeating yokozuna Takanohana and three à Âzeki and losing just one bout to Akebono. It was the first top division yà «shà  by a wrestler from Tomozuna stable since Tachiyama in 1916. He attributed his victory partly to cutting down on his beer consumption. Set a target of eleven wins by the Japan Sumo Association for promotion to à Âzeki in the following tournament in July 2000, he achieved the necessary total on the final day and his promotion was confirmed a few days later. He was 28 years of age, and the 44 tournaments it took him to reach à Âzeki from his top division debut was the second slowest ever. Nevertheless, he went on to maintain the rank for eleven years, eventually becoming the oldest à Âzeki since the start of the Shà Âwa era in 1926, and also the longest serving, in terms of number of tournaments, a record he holds jointly with Chiyotaikai.
After becoming an à Âzeki Kaià  won four more championships and came close to yokozuna promotion on a number of occasions. In March 2001 he won his second championship, losing only to the two yokozuna Takanohana and Musashimaru, and finishing on 13âÂÂ2, one win ahead of them and Musà Âyama. His third yà «shà  came in July 2001, when in the absence of Takanohana he clinched the title on the fourteenth day by defeating Musashimaru. However he was denied the chance of going for consecutive yà «shà  because after each of these triumphs he had to withdraw from the following tournament with sciatica in his lower back, a chronic problem which continued to restrict his mobility for the rest of his career. He was three times a runner-up in 2002, and then after finishing runner up in consecutive tournaments in March and May 2003 he took the July championship, defeating his only rival Chiyotaikai on the final day to win the yà «shà  with a 12âÂÂ3 record. However, after injuring himself in training he could win only seven bouts in the following tournament.
On 6 October 2001, JR Kyushu started a new train service named after him from Hakata to his home town Nà Âgata, making it one of the few JR trains named after a living person. Kaià  was also invited to the launching ceremony, but eventually did not attend because of his health issues.
In 2004, a year in which Kaià  was injury-free, he was runner-up in March, and then won the September tournament virtually unchallenged after two of his three à Âzeki rivals dropped out injured and yokozuna Asashà Âryà « could score only 9âÂÂ6. He finished on 13âÂÂ2, two wins ahead of rank-and-filers Tochinonada and Kyokushà «zan. In the crucial following tournament in November, he dropped his opening bout to Kotomitsuki and then was surprisingly defeated by newcomer Hakuhà  on Day 10 and sekiwake Miyabiyama on Day 12. Although he defeated Asashà Âryà « on the final day to finish runner-up to the yokozuna with twelve wins, it was one win short of the thirteen deemed necessary by the Sumo Association for promotion. Kaià  was set another target of thirteen wins in the following January 2005 tournament, but pulled out with a shoulder injury on the 9th day. This proved to be his final attempt at yokozuna promotion. Due to his injuries he was kadoban (in danger of demotion from à Âzeki) a total of thirteen times, a record second only to Chiyotaikai.
After his eleventh runner-up performance in November 2004 Kaià  seldom contended for the championship or even produced a score in double figures, leading some commentators to suggest his retirement was overdue. However, he continued to set records. His 8âÂÂ7 mark in January 2008 was his 64th kachi-koshi (majority of wins against losses) in the top division, breaking the record previously held by Kitanoumi. In May 2008 he became only the fourth man, after Kitanoumi, à Âshio and Chiyonofuji, to reach 900 career wins, and in July 2008, on his 36th birthday, he moved ahead of Taihà  into third place on the all-time list of top division wins, behind only Chiyonofuji and Kitanoumi. In September 2009 he won his 965th career match, moving past à Âshio into second place on career wins. The November 2009 tournament was Kaià Â's 98th ranked in the top division, breaking the 25-year-old record held by Takamiyama. During this tournament he overtook Kitanoumi to move into second place on top division wins, just one behind Chiyonofuji on 806. He also became the first wrestler to post six successive 8âÂÂ7 scores in a calendar year.
On the third day of the January 2010 tournament, he set a new record for makuuchi wins, breaking former yokozuna Chiyonofuji's record of 807. Ironically, his 808th win was a defeat of fellow veteran à Âzeki and Chiyonofuji disciple, Chiyotaikai. Chiyotaikai would announce his retirement the next day. Kaià  was congratulated by Chiyonofuji, who said it was "a splendid achievement...records are there to be broken." In the same tournament, Kaià  also ended a string of 17 consecutive losses against yokozuna Hakuhà  by defeating him on the 13th day and paving the way for Asashà Âryà « to take the tournament. The May 2010 tournament was Kaià Â's 111th ranked in jà «ryà  or above, breaking the record previously held by Terao. Shortly before the tournament began he was given the prime minister's award for his contribution to promoting sport in Japan. On the final day of the basho he won his 1000th career match with a victory over Kotoà Âshà «, becoming only the second wrestler after Chiyonofuji to reach this landmark.
The dismissal of Kotomitsuki in July 2010 for involvement in illegal gambling on baseball left Kaià  as the only Japanese wrestler in the top two ranks. He expressed sympathy for his fellow à Âzeki, telling reporters that dismissal was harsh and that he wished Kotomitsuki could have been given the chance to reform. On Day 10 of the Nagoya Sumo Tournament, Kaià  lost to fellow à Âzeki Kotoà Âshà «, and the next morning announced he was pulling out of the tournament with a 6âÂÂ4 record, citing an injured left shoulder. However, he returned to hold his rank yet again in the September tournament.
The November 2010 tournament in Kaià Â's hometown of Fukuoka saw him rebound from an opening day loss to win eleven straight matches, challenging for the yà «shà  alongside Hakuhà Â, Baruto and Toyonoshima. This was the first time he had achieved double-digit wins since May 2007, and his run did much to restore interest in a tournament that had seen Hakuhà Â's postwar record winning streak of 63 matches come to an end on just the second day. He finished on 12âÂÂ3, his best performance in six years. As a result, on the January 2011 banzuke he returned to the top à Âzeki position of #1 East for the first time in 21 tournaments. Following the retirement of Tosanoumi he was the oldest active sekitori in this tournament.
In February 2011 he apologised to sumo fans on behalf of the Sumo Association for the cancellation of the March tournament in Osaka due to an ongoing investigation into match-fixing by 14 wrestlers and stablemasters. In that tournament Kaià  would have been hoping to break Chiyonofuji's record of 1045 career wins, of which he was at that time just ten shy. He told reporters, "I can no longer think of my personal career. I must focus on what I should do for the sumo world."
On the fifth day of the "technical examination tournament" held in May 2011 Kaià  achieved his 516th win as an à Âzeki, breaking the record previously held by Chiyotaikai. On Day 12 he fought his 1431st top division match, surpassing Takamiyama's total. His final day victory over Hakuhà  was his 1044th in sumo, just one behind Chiyonofuji, but he commented afterwards, "Under these [test meet] circumstances, I'm not thinking of that." At 38 years and 9 months he was the oldest rikishi in over 70 years to beat a yokozuna.
The July 2011 tournament was Kaià Â's 65th as an à Âzeki, tying Chiyotaikai's record. On the fourth day he slapped down Toyonoshima to earn his first victory of the basho and his 1045th in his career. Congratulated by Chiyonofuji backstage after the bout, Kaià  replied, "I feel sorry to be compared to someone as great as you." The following day he forced out Kyokutenhà  to surpass Chiyonofuji and in first place. On Day 10, having lost to Kotoà Âshà « to fall to 3âÂÂ7, Kaià  announced his retirement from sumo, just a few days short of his 39th birthday, after a discussion with his stablemaster. He remained in sumo as a coach at Tomozuna stable, using the toshiyori or elder name of Asakayama. His retirement left no Japanese at à Âzeki or yokozuna for the first time since January 1993. Speaking at a press conference after his announcement, Kaià  said, "I might not have reached yokozuna or won the championship in front of my home fans in Kyushu but I've had a fulfilling career and have no regrets." His danpatsu-shiki, or official retirement ceremony, took place at the Ryà Âgoku Kokugikan on 27 May 2012, with around 10000 spectators and hundreds of dignitaries, including his fellow March 1988 entrant Takanohana, taking turns to snip his topknot before it was finally removed by his stablemaster Tomozuna.
In February 2014 he established his own stable, Asakayama-beya, in Sumida, Tokyo. In May 2014, the stable had four active wrestlers, and as of January 2018, the roster had increased to 11. In September 2019 the stable produced its first sekitori in Kaishà Â. After the January 2023 tournament it was announced that Asakayama would become the deputy director of the judging department.
During the January 2024 tournament, he withdrew from his judging duties on the twelfth day and announced his intention to undergo surgery for sinusitis. During the same year, in March, he was elected director of the Japan Sumo Association for the first time, his term of office to run until 2026.
Kaià  was solidly a yotsu-sumo wrestler, favouring a right hand outside, left hand inside grip (hidari-yotsu) on his opponent's mawashi or belt. He was well known for his power in the hidari-yotsu position, which even yokozuna Takanohana at his peak had trouble countering. His most common winning technique was a straightforward yori-kiri or force out, which accounted for a third of his career victories, followed by oshi-dashi or push out. He often used his right hand outer grip to win by uwatenage (the overarm throw), which was his most common throwing move. Two of his yà «shà Â-winning bouts were decided by uwatenage, and he was noted for his exceptional power and technique when using this throw. More controversially, he was also known for employing kotenage, (the armlock throw), a technique that can injure the opponent. Kaià  unintentionally caused a number of injuries with this technique over the years, including Tochinonada in 1999, who sustained long-term damage to his elbow, and Kotoryà « in March 2001, who suffered a broken arm.
Kaià Â's wife, , is a former All Japan Women's Pro-Wrestling professional wrestler. Nishiwaki's apprentices in the promotion include Takako Inoue, Mima Shimoda or Aja Kong. The couple met through a journalist who wrote about both sumo and women's pro wrestling while she was undergoing treatment for ovarian cancer.
The couple married in June 1999. The wedding reception in a hotel in Tokyo was attended by some 570 guests, including Takanohana.
Kaià  published an autobiography, Kairiki (meaning "Herculean Strength").