The following are the events in professional sumo during 2013.
Tournaments
Hatsu basho, Ryōgoku Kokugikan, Tokyo, 13 January – 27 January
Haru basho, Osaka Prefectural Gymnasium, Osaka, 10 March – 24 March
Natsu basho, Ryōgoku Kokugikan, Tokyo, 12 May – 26 May
Nagoya basho, Aichi Prefectural Gymnasium, Nagoya, 7 July – 21 July
Aki basho, Ryōgoku Kokugikan, Tokyo, 15 September – 29 September
Kyushu basho, Fukuoka Kokusai Center, Kyushu, 10 November – 24 November
News
January
10: The Nishonoseki stable is reported to close after the Hatsu basho due to the poor health of incumbent stablemaster Nishonoseki (ex-komusubi Kongō). The stable produced the yokozuna Taihō as well as former sekiwake Rikidōzan, who later turned to professional wrestling. 19: The 48th yokozuna Taihō, winner of a record 32 tournament championships, dies aged 72. He is generally regarded as the greatest sumo wrestler of the post-war period. 27: Yokozuna Harumafuji takes his fifth top division championship with a perfect 15–0 record, defeating fellow yokozuna Hakuhō who finishes on 12–3, having also lost to maegashira Myōgiryū and ōzeki Kotoōshū. Former maegashira Bushūyama and former komusubi Takamisakari announce their retirements. Takamisakari will stay in sumo as a coach at his Azumazeki stable under the name "Furiwake". 28: The Japan Sumo Association announces the Nishonoseki stable's closure. Coaches Kitajin and Minatogawa transfer to the Matsugane stable, while coach Fujigane transfers to the Kasugano stable, and Nishonoseki's remaining three wrestlers retire. 30: The spring tournament banzuke organization meeting is held. Tochihiryū makes his jūryō debut, while Oniarashi and Senshō return to the same rank from makushita.
February
14: Endō Shōta, an amateur yokozuna from Nihon University, joins the Oitekaze stable. 15: Chief Cabinet Secretary Yoshihide Suga announces that Taihō will receive the 21st People's Honour Award. He is the second sumo wrestler to receive the award after Chiyonofuji in 1989. 25: The People's Honour Award ceremony for Taihō is held in the Prime Minister's Official Residence.
March
22: On the 13th day of the spring tournament, yokozuna Hakuhō defeats Gōeidō to earn a 13–0 record, and his championship victory is assured when Okinoumi is defeated. It is the fourth time that he has won a top division championship by the 13th day, a record for the 15-day tournament era that he shares with Chiyonofuji. 24: Hakuhō, already determined to be the championship victor, defeats Harumafuji and wins a record ninth perfect victory. Former ōzeki Miyabiyama retires after facing demotion to makushita. He will remain in sumo as a coach at his Fujishima stable, under the name "Futagoyama". 25: The Tokyo District Court rules that the former wrestler Sōkokurai was wrongly dismissed in April 2011 over match fixing allegations. Sōkokurai says, “Let me return to the sumo ring.” The Sumo Association is considering whether to appeal the ruling.
April
1: The Japan Sumo Federation transitions into a public juridical foundation. 3: The Sumo Association announce that they will accept Sōkokurai's return, and that he will appear on the July banzuke at maegashira #15, his last rank before he was thrown out of sumo. 25: The banzuke for the forthcoming May basho is released. Daikihō, Chiyoōtori, Homarefuji and Azumaryū make their makuuchi debut, with Kyokushūhō returning. Okinoumi is promoted to komusubi, becoming the first new san'yaku wrestler from Shimane Prefecture in 121 years.
May
21: On the 10th day of the summer tournament, Hakuhō defeats Gōeidō and sets a record for the highest amount of consecutive double-digit winning records at 38. 26: Hakuhō's 25th championship victory is claimed when Kisenosato is defeated by Kotoshōgiku. Hakuhō then defeats Harumafuji and wins his tenth perfect championship. 29: The Japan Sumo Association announces the retirement of 14 wrestlers, including former jūryō Kotoyutaka, and Yotsuguruma. A banzuke meeting is held in Nagoya. Seirō, Kotomisen, Endō and Ōsunaarashi make their jūryō debut. Endō reached this division in two tournaments, while Kotomisen reached it in 86, the fourth slowest climb in history. Egyptian Ōsunaarashi is the first African sumo wrestler.