NAGOYA (Kyodo) -- Onosato suffered his first defeat as a yokozuna while his fellow grand champion Hoshoryu fell to a third straight defeat as a day of upsets left only four wrestlers with a perfect record at the Nagoya Grand Sumo Tournament on Wednesday.

Onosato (3-1) thought he was heading to another routine win as he drove forward against Oho (1-3) but lacked a final push, backed off in the face of the No. 2 maegashira's counter before getting shoved out surprisingly easily in front of a stunned crowd at the newly built IG Arena.

"I managed to stay leaning forward despite being put under pressure and pushed him back," Oho said after his first win of the meet. "I knew the yokozuna would win if he was able to grab my belt."

It came after another loss for Mongolian-born Hoshoryu (1-3), who found himself on the back foot straight from the off in the face of ferocious shoves to throat and chest from Abi (3-1), but appeared to have rescued an unlikely win as he tried to stay inside the ring with his left toe on the straw.

No. 2 maegashira Abi stepped out attempting to push the yokozuna out, and the referee initially named Hoshoryu the winner. But a replay showed his heel hit the sand outside the ring before Abi, and the ringside judges overturned the decision.

Evergreen Mongolian-born Tamawashi (4-0) continued his perfect start after the 40-year-old went head-on against up-and-coming Hakuoho (2-2) and overpowered his fellow No. 4 maegashira, 19 years his junior, in a gutsy push-out win.

Tamawashi, whose 1,700-plus consecutive appearances since his March 2004 debut is a record in the ancient sport, also moved third with his 1,066 straight outing in the elite makuuchi division.

Sekiwake Kirishima (4-0) opted to take time but was never troubled in grappling out his fellow Mongolian-born wrestler Oshoma (0-4) as the former ozeki left the komusubi debutant still without a victory.

No. 8 maegashira Ichiyamamoto (4-0) pushed down tricky No. 9 maegashira Ura (3-1) in a battle of unbeaten wrestlers, while former ozeki Mitakeumi (4-0), back in makuuchi as No. 16 maegashira after a meet in second-tier juryo in May, also won to stay perfect.

Lone ozeki Kotozakura (2-2) evened his mark after outlasting No. 1 maegashira Wakamotoharu (1-3) in a 1-minute, 16-second marathon to secure a force-out win.

Ukrainian Aonishiki (3-1) remained razor-sharp on the back of his emphatic win over Hoshoryu a day earlier as the No. 1 maegashira's low drive and fierce shoves left Wakatakakage (2-2) with no answer. The sekiwake, who went 12-3 in May, was shoved out to his second straight defeat.