Pittsburgh Pirates' Gaby Sanchez rounds the bases on a solo home run against the Houston Astros in the second inning of a baseball game on Saturday, Sept. 22, 2012, in Houston. (AP Photo/Pat Sullivan)

Houston Astros second baseman Jose Altuve, right, and Pittsburgh Pirates' Neil Walker (18) watch as a double play is completed against Pirates' Andrew McCutchen in the first inning of a baseball game on Saturday, Sept. 22, 2012, in Houston. (AP Photo/Pat Sullivan)

Houston Astros' Fernando Martinez reacts to striking out to end the first inning of a baseball game against the Pittsburgh Pirates, Saturday, Sept. 22, 2012, in Houston. (AP Photo/Pat Sullivan)

Pittsburgh Pirates' Kevin Correia delivers a pitch against the Houston Astros in the second inning of a baseball game on Saturday, Sept. 22, 2012, in Houston. (AP Photo/Pat Sullivan)

Houston Astros' Dallas Keuchel delivers a pitch against the Pittsburgh Pirates in the first inning of a baseball game on Saturday, Sept. 22, 2012, in Houston. (AP Photo/Pat Sullivan)

Pittsburgh Pirates manager Clint Hurdle walks off the field after being ejected by first base umpire Tim Timmons after arguing a close play against the Houston Astros in the second inning of a baseball game on Saturday, Sept. 22, 2012, in Houston. (AP Photo/Pat Sullivan)

Houston Astros relief pitcher Wilton Lopez celebrates a 4-1 win over the Pittsburgh Pirates after a baseball game on Saturday, Sept. 22, 2012, in Houston. (AP Photo/Pat Sullivan)

Pittsburgh Pirates players, bottom, and fans, top, watch the final inning of a baseball game against the Houston Astros, Saturday, Sept. 22, 2012, in Houston. The Astros won 4-1. (AP Photo/Pat Sullivan)

Pittsburgh Pirates' Clint Barmes, bottom, ducks under Houston Astros shortstop Tyler Greene, top, after being forced out on a double play with Alex Presley out at first in the eighth inning of a baseball game on Saturday, Sept. 22, 2012, in Houston. The Astros won 4-1. (AP Photo/Pat Sullivan)