Last season, [Phil] Humber finally got a crack at sticking in the Big Leagues. He made 26 starts and 28 appearances. Though his record was just 9-9, more impressive was his 3.75 ERA and 1.18 WHIP despite pitching in a hitter’s ballpark. What separates Humber from most pitchers is his devastating curveball. In fact, he ranked fourth in Major League Baseball last season with a .159 opposing average against his curveball.
Fangraphs’ Pitch Values for Phil Humber.
UPDATE: James looked at Humber too. /UPDATE