There couldn't be more of a difference from Coors Field to Petco Park. The Rockies are great in Coors - the premier hitting park in the majors - and horrendous at pitcher-friendly Petco where they have lost 18 of the past 23 times.

The starting pitching matchup favors San Diego, too, Eddie Butler, summoned from Triple A Albuquerque, faces veteran Andrew Cashner.

Cashner has a 2.71 career ERA at Petco. The Rockies have averaged 2.9 runs per game the last three years playing at Petco Park.

Butler had a 4.09 ERA in Triple A. In his last 12 starts for the Rockies, he's 1-9 with a 6.91 ERA surrendering 78 hits in 57 1/3 innings. This isn't just pitching at Coors either. Butler's road ERA during this span is 6.42.