Chamberlain is better than Marmol. Stats as reliever: Marmol: 107.2 innings pitched, 150 K, 46 BB, 1.92 ERA, 1.012 WHIP, .514 OPS against Chamberlain: 44.1 innings pitched, 59 K, 15 BB, 1.42 ERA, .925 WHIP, .504 OPS against It's too close to call. However, Marmol is having a better season so far.