Shohei Ono (R) defeats countryman Masashi Ebinuma in the men's 73-kilogram division final as Japan wins three gold medals on Feb. 23, 2019, the second day of the Dusseldorf Judo Grand Slam. (Kyodo)

TOKYO - Judoka Masashi Ebinuma, a three-time world champion and two-time Olympic bronze medalist in the men's 66-kilogram division, announced his retirement Thursday.