Yokozuna Asashoryu ran into a brick wall in the form of Kisenosato suffering a first-day defeat while rival yokozuna Hakuho got off in the winner's circle at the Summer Grand Sumo Tournament on Sunday.

In the day's final bout, the usually fiery Asashoryu never got his attack rolling against komusubi Kisenosato, who pressed forward in a relentless onslaught before sending his opponent crashing onto his back at Ryogoku Kokugikan.

Asashoryu appears the favorite to win consecutive titles based on the hard work he put into pre-tournament training, but it is now anyone's guess how the upset will affect him in the days to come.