The following were the events in professional sumo during 2015.
Tournaments Hatsu basho Ryōgoku Kokugikan, Tokyo, 11 January – 25 January 2015 Hatsu basho results - Makuuchi DivisionEastRankWest15-0-0HakuhoYKakuryū10-5-011-4-0HarumafujiYø11-4-0KisenosatoOKotoshogiku9-6-0øOGōeidō8-7-05-10-0AoiyamaSIchinojō6-9-06-9-0TakayasuKTochiozan7-8-07-8-0TakarafujiM1Tochinoshin6-9-08-7-0TerunofujiM2Ikioi1-14-06-9-0EndōM3Aminishiki6-9-07-8-0ToyonoshimaM4Jōkōryū5-7-37-8-0KaiseiM5øChiyotairyū1-6-89-6-0OkinoumiM6Toyohibiki3-12-05-10-0KyokutenhōM7Chiyoōtori5-8-29-6-0MyōgiryūM8Sadanoumi9-6-010-5-0TamawashiM9Takekaze9-6-06-9-0SōkokuraiM10Homarefuji8-7-08-7-0ShōhōzanM11Yoshikaze8-7-08-7-0KyokushūhōM12Arawashi7-8-08-7-0ŌsunaarashiM13Tokitenkū9-6-08-7-0KotoyūkiM14Chiyomaru7-8-08-7-0SadanofujiM15Kagamiō7-8-011-4-0TokushōryūM16øTosayutaka0-2-13 ø - Indicates a pull-out or absent rankwinning record in boldYusho Winner
Haru basho Osaka Prefectural Gymnasium, Osaka, 8 March – 22 March 2015 Haru basho results - Makuuchi DivisionEastRankWest14-1-0HakuhoYHarumafuji10-5-00-1-14øKakuryūYø9-6-0KisenosatoOKotoshogiku8-7-0øOGōeidō8-7-013-2-0TerunofujiSøOkinoumi0-4-114-11-0TamawashiKMyōgiryū8-7-010-5-0TochiozanM1Ichinojō9-6-07-8-0SadanoumiM2Takarafuji8-7-03-12-0TakayasuM3Aoiyama5-10-04-11-0TakekazeM4Tochinoshin8-7-08-7-0ToyonoshimaM5øEndō4-2-98-3-4øAminishikiM6Kaisei5-10-06-9-0HomarefujiM7Tokushōryū8-7-01-14-0ShōhōzanM8Tokitenkū3-12-05-10-0YoshikazeM9Jōkōryū5-10-07-8-0KyokushūhōM10Kitataiki9-6-011-4-0ŌsunaarashiM11Kyokutenhō6-9-011-4-0ChiyoōtoriM12Kotoyūki6-9-08-7-0IkioiM13Sōkokurai9-6-09-6-0SadanofujiM14Arawashi8-7-08-7-0ToyohibikiM15Gagamaru11-4-07-8-0AmūruM16Chiyomaru8-7-0 ø - Indicates a pull-out or absent rankwinning record in boldYusho Winner
Natsu basho Ryōgoku Kokugikan, Tokyo, 10 May– 24 May 2015 Natsu basho results - Makuuchi DivisionEastRankWest11-4-0HakuhoYHarumafuji11-4-00-0-15øKakuryūYø11-4-0KisenosatoOKotoshogiku6-9-0øOøGōeidō8-6-112-3-0TerunofujiSMyōgiryū7-8-08-7-0TochiozanKIchinojō8-7-09-6-0TakarafujiM1Tochinoshin9-6-04-11-0ToyonoshimaM2Aminishiki6-9-08-7-0SadanoumiM3øŌsunaarashi4-4-70-2-13ChiyoōtoriM4Tokushōryū6-9-04-11-0KitataikiM5Tamawashi6-9-07-8-0GagamaruM6Aoiyama9-6-01-4-10øSōkokuraiM7Sadanofuji6-9-08-7-0TakekazeM8Takayasu10-5-07-8-0HomarefujiM9Endō6-9-010-5-0IkioiM10Okinoumi9-6-010-5-0KaiseiM11Kyokushūhō9-6-02-13-0ArawashiM12Toyohibiki6-9-03-12-0FujiazumaM13Chiyomaru3-12-010-5-0YoshikazeM14Kyokutenhō8-7-05-10-0JōkōryūM15Kotoyūki8-7-07-8-0TakanoiwaM16Amūru9-6-0 ø - Indicates a pull-out or absent rankwinning record in boldYusho Winner
Nagoya basho Aichi Prefectural Gymnasium, Nagoya, 12 July – 26 July 2015 Nagoya basho results - Makuuchi DivisionEastRankWest14-1-0HakuhoYøHarumafuji1-1-1312-3-0KakuryūYø10-5-0KisenosatoOGōeidō9-6-08-7-0KotoshogikuOTerunofuji11-4-010-5-0TochiozanSIchinojō4-11-04-11-0TakarafujiKMyōgiryū8-7-08-7-0TochinoshinM1Sadanoumi6-9-06-9-0TakayasuM2Aoiyama8-7-02-13-0IkioiM3Kaisei6-9-06-9-0AminishikiM4Takekaze5-10-011-4-0OkinoumiM5Tokushōryū7-8-05-10-0KyokushūhōM6Gagamaru6-9-08-7-0TamawashiM7Toyonoshima7-8-012-3-0YoshikazeM8Ōsunaarashi11-4-010-5-0SadanofujiM9Homarefuji6-9-05-10-0KitataikiM10Amūru8-7-06-9-0TokitenkūM11Kyokutenhō3-12-010-5-0EndōM12Kotoyūki8-7-06-9-0HidenoumiM13øChiyotairyū8-4-35-10-0ToyohibikiM14Kagamiō9-6-07-8-0SeirōM15Satoyama5-10-06-9-0TakanoiwaM16ø ø - Indicates a pull-out or absent rankwinning record in boldYusho Winner
Aki basho Ryōgoku Kokugikan, Tokyo, 13 September – 27 September 2015 Aki basho results - Makuuchi DivisionEastRankWest0-3-12øHakuhoYKakuryū12-3-00-0-15øHarumafujiYø12-3-0TerunofujiOKisenosato11-4-07-8-0GōeidōOKotoshogiku11-4-08-7-0TochiozanSMyōgiryū8-7-010-5-0TochinoshinKOkinoumi6-9-07-8-0AoiyamaM1Yoshikaze11-4-08-7-0ŌsunaarashiM2Sadanofuji2-13-06-9-0SadanoumiM3øTakayasu1-3-119-6-0IchinojōM4Takarafuji4-11-04-11-0TamawashiM5Kaisei6-9-08-7-0AminishikiM6Tokushōryū6-9-08-7-0EndōM7Amūru8-7-05-10-0TakekazeM8Toyonoshima10-5-06-9-0GagamaruM9Kagamiō4-11-09-6-0KotoyūkiM10Kyokushūhō8-7-06-9-0ChiyotairyūM11Homarefuji9-6-011-4-0IkioiM12Chiyoōtori6-9-07-8-0DaieishōM13Tokitenkū7-8-07-8-0KitataikiM14Sōkokurai8-7-07-8-0AsasekiryūM15Hidenoumi6-9-07-8-0SeirōM16ø ø - Indicates a pull-out or absent rankwinning record in boldYusho Winner
Kyushu basho Fukuoka Kokusai Center, Kyushu, 8 November – 22 November 2015 Kyushu basho results - Makuuchi DivisionEastRankWest9-6-0KakuryūYHakuho12-3-013-2-0HarumafujiYø9-6-0TerunofujiOKisenosato10-5-08-6-1øKotoshogikuOGōeidō8-7-08-7-0TochiozanSMyōgiryū2-13-07-8-0TochinoshinKYoshikaze8-7-06-9-0IchinojōM1øŌsunaarashi5-9-17-8-0AoiyamaM2Okinoumi5-10-05-9-1øToyonoshimaM3Aminishiki8-7-012-3-0IkioiM4Endō4-11-04-11-0AmūruM5Sadanoumi5-10-08-7-0KotoyūkiM6Homarefuji3-12-09-6-0KaiseiM7Kyokushūhō9-6-08-7-0TokushōryūM8Takarafuji10-5-08-7-0TamawashiM9Sadanofuji4-11-09-6-0SōkokuraiM10Shōhōzan12-3-06-7-0GagamaruM11Mitakeumi8-7-07-8-0TakekazeM12Takayasu9-6-08-7-0ChiyotairyūM13Toyohibiki7-8-06-9-0DaieishōM14øTokitenkū0-0-157-8-0KitataikiM15Chiyoōtori10-5-03-12-0AsasekiryūM16ø ø - Indicates a pull-out or absent rankwinning record in boldYusho Winner
News January 13: The third day of the January tournament is the first full house on the third day at the Ryōgoku Kokugikan in 18 years. 16: Former komusubi Hōmashō retires and adopts the elder name Tatsutagawa. 18: Yokozuna Hakuhō defeats Aminishiki, becoming the fourth wrestler in history to achieve 600 wins as a yokozuna. At 45 tournaments, it is the fastest time to achieve the milestone. 20: Maegashira Chiyoōtori obtains a fusenshō win upon the withdrawal of his opponent Jōkōryū. Chiyoōtori re-entered the tournament on the fifth day after withdrawing on the second day, becoming the first top division wrestler in 54 years (after Dewanishiki in July 1961) to obtain a fusenshō win after re-entering a tournament. 23: On the 13th day of the tournament, yokozuna Kakuryū defeats yokozuna Harumafuji, and yokozuna Hakuhō defeats ōzeki Kisenosato, granting Hakuhō his fifth consecutive championship and his 33rd overall. Hakuhō breaks the championship record held by Taihō since January 1971. 24: Hakuhō wins his 800th bout in the top division with a defeat of his fellow yokozuna Harumafuji, only the fourth man after Kitanoumi, Chiyonofuji and Kaiō to reach this landmark. 25: The final day of the tournament is a sell-out, meaning every day of a basho held in the Ryōgoku Kokugikan has sold out for the first time in 18 years. Hakuhō completes his 11th zenshō yūshō or perfect score (another record) with a win over Kakuryū. There are a record 61 sponsor's envelopes placed on his bout. 27: Hakuhō receives criticism after telling a post-tournament press conference that he should not have been made to redo his match with Kisenosato as "looking at the video, even a child could see (that I won)." His stablemaster Miyagino apologizes on his behalf. 29: The Japan Sumo Association's board of directors approves the introduction of Hisashi Ōmichi, a fourth year student at Toyo University, at makushita #10. 31: Former komusubi Wakakōyū's retirement ceremony is held at the Kokugikan.
February 1: The Asahiyama stable closes, and its wrestlers transfer to the Isegahama stable, while its staff transfer to the Asakayama stable. 12: Former ōzeki Kotoōshū acquires the elder name Naruto.
March
5: The Japan Sumo Association's board of directors decides to lower the physical standards for the new apprentice test. For those who are expected to graduate from junior high school and take the test before the March tournament, the minimum weight standard will be lowered from 67 kilograms to 65. 8: Yokozuna Kakuryū withdraws from the March tournament due to a rotator cuff injury in his left shoulder. Due to his absence, the bouts for the second day, which had already been decided, were reorganized. 9: Jūryō Wakanosato becomes the sixth wrestler in history to achieve a career total of 900 wins. 12: Yokozuna Hakuhō becomes the seventh wrestler in history to achieve a career total of 900 wins. 14: New sekiwake Terunofuji becomes the first in 75 years to achieve seven consecutive victories from the first day of his debut in the rank. 20: Yokozuna Hakuhō is defeated by sekiwake Terunofuji, ending the winning streak that started on the seventh day of the November 2014 tournament at 36. 21: The match between maegashira Ichinojō and sekiwake Terunofuji is paused for a water break, marking the first instance in history of the same two wrestlers entering a water break in two consecutive tournaments. 22: Hakuhō achieves his 34th top division championship, breaking his own record. He also achieves six consecutive tournament championships, becoming the second wrestler in history to do so since Taihō.
The spring regional tour begins at the following locations: 29: Ise Shrine, Mie Prefecture (Honozumo ceremonial tournament held in the shrine's precincts) 30: Minamiawaji, Hyōgo Prefecture 31: Himeji, Hyōgo Prefecture
April The spring regional tour continues at the following locations: 3: Yasukuni Shrine, (Honozumo ceremonial tournament) The Kudan, Chiyoda-ku, Tokyo 4: Fujisawa, Kanagawa Prefecture 5: Shizuoka, Shizuoka Prefecture 10: Misato, Saitama Prefecture 11: Ichikawa, Chiba Prefecture 12: Hitachiōmiya, Ibaraki Prefecture 18: Takasaki, Gunma, Gunma Prefecture 19: Mito, Ibaraki Prefecture 25–26: Makuhari Messe convention center, Chiba Prefecture, at Niconico's "Chokaigi 2015"
27: For the May banzuke, jonokuchi wrestler Kotoanbai of Sadogatake stable changes his birthplace registration from Shizuoka Prefecture to Indonesia, marking the first time a wrestler from this country was listed in the banzuke.
May
10: The May tournament sees Kakuryu once again unable to compete due to injury. This is the first time since Musashimaru in 2003 that a yokozuna has missed two tournaments in a row. 24: Terunofuji follows up his superb performance in March by winning his first top division tournament championship. His victory over Aoiyama on the final day, coupled with Hakuho's surprise defeat to Harumafuji, means Hakuho's streak of six consecutive championships comes to an end. Terunofuji's score of 12–3 is actually not as good as the previous tournament, but no-one else scored better than 11–4. Terunofuji also wins the Fighting Spirit Award, and is virtually guaranteed promotion to ozeki. There are no other sansho winners. The juryo title goes to Kagamio. In the sandanme division, 44-year-old , who spent just one tournament in juryo exactly ten years previously, announces his retirement after an exceptional 29 years and 174 basho in sumo. 27: Terunofuji's promotion to ozeki is confirmed.
June 20 : Elder of the Sumo Association Otowayama Oyakata, former ozeki Takanonami, dies of acute cardiac failure at age 43.
July 13: Yokozuna Harumafuji pulls out of the Nagoya tournament on the second day because of an elbow injury. He had had surgery on the same elbow in May. Way down in the jonokuchi division Brodik Henderson, a 20 year old from Victoria, British Columbia, who joined Nishikido stable in March and is known as Homarenishiki, makes his first official appearance in a tournament. 26: Hakuhō wins his 35th championship, finishing on a 14–1 record. His only defeat in the tournament is to sekiwake Tochiozan, who had also defeated returning yokozuna Kakuryu and is given the Outstanding Performance Award. Kakuryu is joint runner-up on 12–3 with maegashira Yoshikaze, who wins the Fighting Spirit Award. Terunofuji finishes on 11–4 in his ozeki debut. Kyokutenhō can only score 3–12, and faces certain demotion to the juryo division. Fellow veteran Wakanosato faces demotion to makushita. The juryo division championship is won by Mitakeumi, who only made his professional debut in March.