Yokozuna Harumafuji was sent to a shock defeat at the hands of Myogiryu on the second day of the Summer Grand Sumo Tournament on Monday.

Hakuho beat the daylights out of Aminishiki to stay on course for his 25th career title after winning the spring tourney with an unblemished 15-0 mark.

Harumafuji stumbled with another 9-6 meltdown in March, the same mark he posted in his yokozuna debut last November. But the fiery Mongolian has also gone 15-0 to win three of the previous five tournaments.

In the day’s finale at Ryogoku Kokugikan, inconsistency struck again as Harumafuji proved to be a lightweight, when he immediately let Myogiryu inside for an abrupt shove over the ridge.

“I just went all out without retreat,” said Myogiryu, who got his second kinboshi — a maegashira win against a yokozuna — after also beating Harumafuji in November. “I’m happy. I have to keep my focus from tomorrow.”

Hakuho sent Aminishiki (0-2) to the dirt with a smack-down after a salvo of quickfire shoves following the tachiai, improving to 29-4 over his career against the top-ranked maegashira.

Hakuho is aiming to tie retired yokozuna Asashoryu for third on the all-time list with his 25th Emperor’s Cup. At the spring basho, he surpassed yokozuna greats Futabayama and Taiho with his ninth perfect championship.

Kisenosato (2-0), who escaped with a narrow victory on the opening day, grinded out Kitataiki (0-2) after getting his right hand outside and a left hand in on the mawashi for a textbook frontal force-out.

Ozeki Kotooshu, who is facing demotion for the sixth time after withdrawing with an elbow injury in March, outflanked Goeido (1-1), toppling the sekiwake over the edge to improve to 2-0 to move a step closer to the eight wins he needs to retain his rank.

Kotoshogiku (2-0) made mincemeat of Okinoumi (0-2), wrapping both arms around his opponent before ushering the komusubi out in a lopsided encounter.

Kakuryu made it 4-for-4 for sumo’s second-highest rank, but the bout really belonged to Tochiozan after his komusubi opponent inadvertently stepped out with his own forward momentum as the ozeki deftly circled.