Yokozuna Kisenosato's bid for a third consecutive championship title took an early blow with a shock defeat to komusubi Yoshikaze on Sunday, the opening day of the Summer Grand Sumo Tournament.

Kakuryu also suffered an upset, but the other two yokozuna — Hakuho and Harumafuji — emerged unscathed to make winning starts at Ryogoku Kokugikan.

Kisenosato was declared fit to fight at the 15-day tourney in Tokyo on Thursday after recovering from injuries to his left upper arm and chest muscles suffered late in the previous meet in March.