Sumo wrestler Hoshoryu holds a fish to celebrate being promoted to the sport's highest rank of yokozuna
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Sumo's only grand master Hoshoryu vowed not to "tarnish the title" after being officially promoted to the highest rank on Wednesday, 15 years …
Mongolian-born highest-ranked sumo Terunofuji (R) is retiring from the sport
Terunofuji, who has won 10 tournaments in his career, is sumo's only active yokozuna -- the sport's highest rank
Terunofuji completed just two of six tournaments last year as he dealt with injuries and other health problems
Sumo is facing a potential chasm at the top of the ancient sport for the first time in over 30 years after the only yokozuna, Terunofuji, anno…