Rank-and-file grappler Endo put himself back in the championship race Friday at the Summer Grand Sumo Tournament with an upset victory over ozeki Takakeisho.The popular No. 8 maegashira thrust down Takakeisho on Day 13 at Tokyo's Ryogoku Kokugikan to leave both men with a 10-3 record -- two wins behind outright leader Terunofuji, who is in a prime position to claim his second championship in a row.Fighting as an ozeki for the first time since September 2017, Terunofuji (12-1) can clinch his fourth Emperor's Cup by winning either of his two remaining bouts at the 15-day meet following his vi…READ FULL ARTICLE