Aroldis Chapman / Josh Hader

Aroldis Chapman and Josh Hader were named the AL and NL Relievers of the Year after the hard-throwing left-handers dominated MLB. Chapman saved 37 games for the New York Yankees and struck out 85 batters in 57 innings pitched. Josh Hader struck out a gaudy 138 batters in his 75 innings while locking down 37 saves of his own.