The Astros go for their tenth win in a row and 14th in their last 15 games as Roberto Hernandez hosts J.A. Happ and the Mariners in Houston. Happ is off to a good start with a 2.30 ERA. He walked just three batters in his 27 1/3 innings of work. Opponents own a low batting average against Hernandez, just .225, but with nine of their 20 hits going for extra bases, they are slugging .438.

Colorado and San Diego are locked in a battle for second place in the NL West as Tyler Matzek takes on James Shields. Matzek owns a 2.70 ERA despite 13 walks and 13 strikeouts in 20 innings. When walks and strikeouts are in parity, either walks are too high or strikeouts are too low for long term success. In this case, the walks are too high. Matzek was able to balance this by allowing just one home run so far. Shields saw his Ks soar on moving to the NL, with 41 strikeouts in 31 innings. He owns a 1.38 ERA at PETCO Park so far this season.

Enjoy!