Onosho upset Harumafuji in his first match against a yokozuna on Thursday, becoming the only wrestler with a perfect 5-0 record at the Autumn Grand Sumo Tournament.
The 21-year-old No. 3 maegashira dodged the yokozuna's forceful shoves and got him off balance before slapping him down into a forward somersault on the raised dohyo ring on the fifth day of the 15-day tourney at Ryogoku Kokugikan in Tokyo.
"I wanted to tackle the match with courage but without being too worked up, and I was able to do that," Onosho said.