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The Diamondbacks' bullpen has had a great month of May, but the staff as a whole is pitching very well right now. For the month of May, the team ERA is down to 2.66, good for 3rd in the Majors, and only 0.03 behind the Braves and 0.02 behind the Athletics.

Team ERAs in May (through games of May 16)

Rank TEAM ERA
1 Atlanta Braves 2.63
2 Oakland Athletics 2.64
3 Arizona Diamondbacks 2.66
4 Detroit Tigers 2.83
5 San Francisco Giants 2.87
6 Chicago White Sox 3.01
7 Philadelphia Phillies 3.05
8 New York Mets 3.14
9 Cleveland Indians 3.27
10 Los Angeles Dodgers 3.29

Looking at the individual pitchers, almost all of the damage to the team ERA has been done by the back end of the starting rotation.

Pitcher May ERA IP ER
Daniel Hudson 2.61 20.7 6
Ian Kennedy 1.35 20.0 3
Joe Saunders 4.82 18.7 10
Armando Galarraga 6.75 14.7 11
Josh Collmenter 0.00 9.7 0
Barry Enright 10.80 5.0 6
Juan Gutierrez 0.00 6.7 0
Esmerling Vasquez 0.00 6.0 0
J.J. Putz 0.00 5.0 0
Sam Demel 0.00 4.3 0
Joe Paterson 0.00 4.0 0
Aaron Heilman 0.00 4.0 0
David Hernandez 1.42 6.3 1
Team 2.66 125.0 37

The top 10 pitchers for the month of May (excluding Saunders, Galarraga, and Enright) have an amazing 1.04 ERA so far this month. Unfortunately, the team still only has a 6-8 record for May, because the offense has slumped to a .209 batting average (lowest in the Majors in May) and has scored only 3.1 Runs/Game.