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Ian Kennedy leads a Diamondbacks staff that has been dominant over the past week, but one that isn't built for sustained success.
During their current win streak, the Diamondbacks' pitching has been nothing short of phenomenal. Arizona has yielded less than a run (0.83 runs) per game over that stretch, but this is out of the ordinary for the D'Backs.
Arizona's team ERA this season is 3.90 (10th out of 16 teams in the league). Opponents are hitting .259 against the Diamondbacks, ranking Arizona ninth in the NL in that category.
In the first half, Arizona's team ERA was 4.08, and only with the recent stretch of pitching dominance has that come down slightly.
While ace Ian Kennedy is having a fantastic season, becoming the first pitcher in the NL to reach 17 wins with his victory on Sunday, the statistics from the rest of the staff betray the actual vulnerability of D'Backs pitching to regress in September.
The numbers for the rest of Arizona's starters:
Joe Saunders: 9-11, 3.82 ERA, 1.33 WHIP
Daniel Hudson: 13-9, 3.75 ERA, 1.26 WHIP, .270 BAA
Josh Collmenter: 8-8, 3.19 ERA, 1.06 WHIP
Wade Miley (rookie in place of injured Jason Marquis): 1-1, 4.50 ERA, 1.80 WHIP
The numbers don't favor continued dominance by Arizona starters, and while the bullpen has been excellent for the D'Backs, a regression in overall pitching performance is highly likely.