Wade Miley, Arizona Diamondbacks (15-10, 3.10)
Miley has been sharp in two appearances (one start) against Colorado this season, going 1-0 with a 0.82 ERA covering 11 innings. He’s turned in a quality start in five of his last six outings, including last Saturday against the Giants when he gave up three runs over seven frames. He's 3-0 with a 1.88 ERA in four career games (three starts) against the Rockies.
James Shields, Tampa Bay Rays (14-9, 3.77)
Shields is coming off a loss at New York on Saturday, when he surrendered four runs on six hits in 6 1/3 innings. It ended a stretch of eight straight starts in which he permitted three runs or fewer. Shields has turned in two stellar efforts against the Blue Jays this season, limiting them to one run on two hits in eight innings on Aug. 7 and striking out 10 on May 23.
Rick Porcello, Detroit Tigers (9-12, 4.57)
Porcello has not won since Aug. 7 and has not pitched six full innings in any of his last four starts. The 23-year-old yielded eight hits in 4 2/3 innings to the light-hitting Indians last weekend in a no decision. Porcello was battered around for three runs and 12 hits in just 3 2/3 innings against Minnesota on July 5 and has surrendered a total of 12 runs (eight earned) and 27 hits in 13 2/3 frames across three starts versus the division rivals in 2012.
Ryan Vogelsong, San Francisco Giants (12-9, 3.65)
The Giants are hoping Vogelsong returns to form after going 0-2 with a 12.34 ERA in his previous three starts while surrendering 20 hits in 11 2/3 innings over that span. He allowed seven runs (six earned) on over 3 1/3 innings last Sunday against the Diamondbacks, and his ERA has climbed from 2.27 to 3.65 since Aug. 8. He’s 1-1 with a 3.60 ERA in two starts against San Diego this season.