Dee ihe na-esote paragraf a - N'ọnwa Ọktoba afọ 1964, mgbe Yokoyama bụ nwa akwụkwọ na Mahadum Rikkyo, a họpụtara ya n'òtù egwuregwu mba Japan maka asọmpi Olimpik nke 1964 na Tokyo. N'asọmpi a, ọ malitere ma kpọọ egwuregwu niile n'aha Tsukasa Hosaka gbajiri aka ya tupu asọmpi Olympic. Mgbe nke ahụ gasịrị, Yokoyama ghọrọ onye na-eche nche oge niile na ndị otu mba Japan. N'afọ 1968, a họpụtara ya na Japan maka 1968 Summer Olympics na Mexico City. Ọ gbara bọọlụ niile na Japan wee nweta ọla nchara. N'afọ 2018, a họpụtara ndị otu a na Japan Football Hall of Fame. O sokwa gbaa bọọlụ n'egwuregwu Asia n'afọ 1966, 1970 na 1974.
Ọ dị mma. Ọ gbara egwuregwu 49 maka Japan ruo 1974.