As coach Hirobumi Watarai (度会 博文, Watarai Hirobumi, born January 26, 1972) is a Japanese former professional baseball infielder.

He played in Nippon Professional Baseball (NPB) for the Tokyo Yakult Swallows from 1994 to 2008.

His son is Ryūki Watarai, a professional baseball player for the Yokohama DeNA BayStars.

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