Brad Ziegler: Knee problem one reason for pitching problem

Diamondbacks reliever Brad Ziegler cited on Tuesday knee discomfort as one reason for his recent struggles, per azcentral.com.

Ziegler, who had just given up a walkoff home run to Padres rookie Cory Spangenberg, has given up 15 runs on 28 hits in his last 20 1/3 innings pitched as his ERA has soared from 2.18 to 3.55.