Hakuho benefited from a slip-up by fellow Mongolian grand champion Harumafuji on Wednesday to seize sole possession of the Summer Grand Sumo Tournament lead with four days remaining.

On a day when Kisenosato became the second grand champion after Kakuryu to make an injury-enforced exit from the 15-day tournament, 37-time Emperor's Cup winner Hakuho improved his mark to 11-0 at Tokyo's Ryogoku Kokugikan.

Harumafuji is alone in second at 10-1, while promotion-chasing sekiwake Takayasu, ozeki Terunofuji, and the 10th-ranked maegashira pair of Ura and Tochinoshin are tied for third at 9-2.

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Hakuho was given a run for his money in the day's penultimate bout, but once again came through with flying colors, scoring a clinical uwatehineri twisting overarm throw against ozeki Goeido to keep his spotless record.

Fighting with his rank on the line for the fifth time in his career, Goeido dropped to 6-5 and needs to win at least two more bouts to avoid demotion to sekiwake for the July meet in Nagoya.

Hakuho seized control when Harumafuji inadvertently stepped over the straw bales to hand komusubi Mitakeumi his fifth win.

Takayasu put fourth-ranked maegashira Tochiozan (5-6) on his knees to move within one win of the 10 he needs here -- or 33 over three straight tournaments -- to be considered for promotion to sumo's second-highest rank of ozeki.

Mongolian ozeki Terunofuji had his hands full with Aoiyama (2-9) but bided his time and came through with an overarm throw to put the Bulgarian No. 3 maegashira on the dirt.

Kotoshogiku survived another day, tipping top-ranked maegashira Chiyonokuni (2-9) over the edge of ring to improve to 4-7.

Kotoshogiku narrowly missed out on a swift return to ozeki at the last tournament, where he posted a 9-6 record.