He led the national collegiate league in ERA , and was sixth in strikeouts ( 67 ) and seventh in wins .
Yoon broke out in 2010 when he racked up 6 wins as a starter and posted a 0.85 ERA in 52.2 innings pitched .
Yoon led the national collegiate league in ERA , and was sixth in strikeouts ( 67 ) and seventh in wins .
Yoon broke out in 2010 when he racked up 6 wins as a starter and posted a 0.85 ERA in 52.2 innings pitched .