Yusuke Kosai (小斉 祐輔, born April 30, 1983, in Matsubara, Osaka) is a Japanese professional baseball infielder for the Tohoku Rakuten Golden Eagles in Japan's Nippon Professional Baseball.

Yusuke Kosai
Kosai with the Fukuoka SoftBank Hawks
Outfielder
Born: (1983-04-30) April 30, 1983 (age 41)
Bats: Left
Throws: Right
NPB debut
June 3, 2006, for the Fukuoka SoftBank Hawks
NPB statistics
(through 2015 season)
Batting average.209
Home runs7
RBI32
Teams
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