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Diamondbacks are only 6-10 when they get a Quality Start; average NL team wins 2 out of 3 | May
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A Quality Start (QS)  for a starting pitcher is defined as one in which the pitcher goes six or more innings while allowing three or fewer earned runs. When a team gets a QS, they usually manage to win the game (The NL average Win% in QS is 64.2% in 2010).  For the Diamondbacks in 2010, however, even a QS is not enough to guarantee a winning record; the D'backs are only 6-10 in these situations. How is this happening? The bullpen is to blame in a few of these cases, but surprisingly, the offense has been the bigger culprit. There have been only two games in which the Diamondbacks' starter left the game with a QS and the lead, only to see the team end up losing. These were both Dan Haren starts, on 4/15 and 5/1. In the other eight QS losses, the offense didn't score enough, so the pitcher was already behind when he left the game. In fact, in these eight games, the Diamondbacks only scored a total of 17 runs. A few times, the bullpen also let the game slip further away, but did not actually blow the lead. Here are the stats (through May 13) for the National League Pitching Staffs when they do get a Quality Start. The Diamondbacks have the lowest winning percentage when they do get a QS.
Team Wins Losses Win% in QS
Rockies 13 2 86.7
Padres 14 3 82.4
Nationals 11 4 73.3
Giants 16 6 72.7
Phillies 10 4 71.4
Reds 12 5 70.6
Mets 11 5 68.8
Dodgers 11 5 68.8
Pirates 8 4 66.7
Marlins 14 7 66.7
Cardinals 19 10 65.5
Braves 8 7 53.3
Astros 9 8 52.9
Brewers 7 8 46.7
Cubs 10 12 45.5
Diamondbacks 6 10 37.5
NL 179 100 64.2
The Cardinals have received a league leading 29 Quality Starts in 35 games, an 89.2% clip, which puts them well ahead of the Giants and Cubs with 22. The Diamondbacks are in the middle of the pack with 16. Overall, the National League is achieving Quality Starts in just over half of its starts.
Team Total QS Games QS%
Cardinals 29 35 82.9
Giants 22 33 66.7
Cubs 22 35 62.9
Marlins 21 35 60.0
Padres 17 34 50.0
Reds 17 34 50.0
Astros 17 34 50.0
Dodgers 16 34 47.1
Mets 16 35 45.7
Diamondbacks 16 35 45.7
Rockies 15 34 44.1
Braves 15 34 44.1
Brewers 15 34 44.1
Nationals 15 35 42.9
Phillies 14 33 42.4
Pirates 12 34 35.3
NL 279 548 50.9