Nine-time grand champion Mongolian wrestler Harumafuji, 33, has apologised for "causing trouble".
A champion sumo wrestler has been accused of assaulting another wrestler with a beer bottle during a night of drinking, breaking the man's skull. Both wrestlers are from Mongolia and the incident reportedly occurred during a party with other Mongolian wrestlers.
Takanoiwa, who belongs to the Takanohana stable and has been absent from the tournament from the first day, submitted to the Japan Sumo Association a doctor's report confirming his injuries, including skull base fracture, that take two weeks to heal completely.
Sumo association officials told AFP news agency that exactly what happened remains unconfirmed.
"As for Takanoiwa's injuries, I apologize deeply for causing trouble for stable master Takanohana, people affiliated with Takanohana stable, the Sumo Association and my stable master", the wrestler told local reporters Tuesday.
Weighing in at 300 pounds, Harumafuji is considered a lightweight sumo wrestler, and is lauded for his technique in the ring.
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Sumo's origins lie in Shinto rites performed in temples, and Japanese fans expect wrestlers competing in the ancient sport to live up to strict standards of good behaviour.
Fighters are even expected not to show emotion after victories so as not to be inconsiderate to the losers.
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In June 2007, a stable master and his three wrestlers were convicted over a bullying-death of a 17-year-old junior wrestler.
A sumo wrestling grand champion is under fire after allegedly hitting a fellow wrestler over the head with a beer bottle. A match-fixing scandal followed in 2011.
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