TOKYO (Kyodo) -- Ozeki Onosato survived a challenging battle with sekiwake Daieisho to advance to a flawless 14-0 Saturday at the Summer Grand Sumo Tournament.

A day after securing back-to-back championships and yokozuna promotion, the 24-year-old Onosato maintained his bid to go undefeated through a 15-day grand tournament for the first time in his career.

He gave ground as explosive pusher-thruster Daieisho (9-5) opened with a strong charge, but slipped to the side as the sekiwake came in for the kill, before pushing him off the dohyo.

Yokozuna Hoshoryu improved to 11-3 by forcing out ozeki Kotozakura (8-6) in the final bout of Day 14 at Ryogoku Kokugikan arena.

Hoshoryu established a strong inside position from the jump and stayed largely in control despite Kotozakura denying him a belt grip. The Mongolian yokozuna staved off a last-ditch arm-lock throw attempt before hoisting the ozeki over the straw bales.

Sekiwake Kirishima (11-3) showed veteran poise as he thrusted out talented 21-year-old No. 7 maegashira Hakuoho (8-6). By logging his 11th win, the Mongolian-born former ozeki has set himself up for a run at promotion back to the second-highest rank in coming meets.

Komusubi Wakatakakage also advanced to 11-3 by pushing out No. 3 maegashira Hiradoumi (6-8) and consigning him to a losing record for the tournament.

Exciting Ukrainian No. 9 maegashira Aonishiki moved up to 10-4 with a force-out victory over No. 12 maegashira Atamifuji (7-7). The 21-year-old Aonishiki has now racked up double-digit win totals in both tournaments since his debut in the elite makuuchi division in March.