Walker had four hits in the loss.

Pittsburgh rallied for three runs in the sixth inning. But aggressive base running and a costly error helped Houston score three times in the eighth to win it. In the process, the Pirates fell out of first place.

The Astros drew first blood against Paul Maholm. Carlos Lee led off the second inning with a double. Jason Michaels singled him to third. A passed ball by Michael McKenry allowed Lee to score the first run of the game. Houston added it to it in the next frame. Jeff Keppinger homered after Angel Sanchez walked to make it 3-0 Astros.

Bud Norris kept the Pirates off the board until the fifth inning when Neil Walker homered with no one on to cut the lead to two runs. Pittsburgh took the lead and sent Norris packing with a three runs sixth. Ly...

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