A pair of AL West rivals open up a series out in Northern California. The Houston Astros are on the road in the first of a four game set with the Oakland A?s Monday night. Houston was in action Sunday night as they played the rubber game of a three game set with the Red Sox at home. Oakland capped a surprising four game sweep of the Yankees at home, winning 4-3 Sunday afternoon. The Astros took two of three in the last series between the teams, which came April 28-30 in Houston.