Yokozuna Kakuryu and sekiwake Tochinoshin stayed undefeated Saturday to remain joint leaders of the Summer Grand Sumo Tournament on Day 7.Pre-tournament favorite Kakuryu took another step at Ryogoku Kokugikan toward his sixth top-level title by beating No. 3 maegashira Chiyotairyu, who remains winless in 11 matches against the 33-year-old Mongolian grand champion.Kakuryu ended the first week of the 15-day tournament by blowing away Chiyotairyu (2-5) from the opening jump. Planting both hands on Chiyotairyu's chest, the yokozuna gave his opponent little chance of escaping the quick frontal f…READ FULL ARTICLE