FILE - This July 14, 2012 file photo shows San Francisco Giants' Melky Cabrera swinging for an RBI single off Houston Astros' Lucas Harrell in the fifth inning of a baseball game in San Francisco. Cabrera has been suspended for 50 games without pay after testing positive for testosterone. The commissioner's office says the suspension is effective immediately. Major League Baseball said on Wednesday, Aug. 15, 2012, that Cabrera tested positive for the banned performance-enhancing substance, which violates MLB's joint drug prevention and treatment program.(AP Photo/Ben Margot, File)
** FILE ** Houston Astros manager Brad Mills (right) discusses a call with umpire Gary Darling during the third inning of a baseball game against the Milwaukee Brewers on Saturday, Aug. 11, 2012, in Houston. (AP Photo/Dave Einsel)
** FILE ** Houston Astros manager Brad Mills (right) discusses a call with umpire Gary Darling during the third inning of a baseball game against the Milwaukee Brewers on Saturday, Aug. 11, 2012, in Houston. (AP Photo/Dave Einsel)
Washington Nationals' Jordan Zimmermann delivers a pitch against the Houston Astros in the first inning of a baseball game Thursday, Aug. 9, 2012, in Houston. (AP Photo/Pat Sullivan)
Washington Nationals' Jordan Zimmermann delivers a pitch against the Houston Astros in the first inning of a baseball game Thursday, Aug. 9, 2012, in Houston. (AP Photo/Pat Sullivan)
Washington Nationals' Gio Gonzalez delivers a pitch against the Houston Astros in the fifth inning of a baseball game, Wednesday, Aug. 8, 2012, in Houston. (AP Photo/Pat Sullivan)
Washington Nationals' Gio Gonzalez delivers a pitch against the Houston Astros in the fifth inning of a baseball game, Wednesday, Aug. 8, 2012, in Houston. (AP Photo/Pat Sullivan)
Washington Nationals' Danny Espinosa (8) is welcomed back to the dugout by bench coach Randy Knorr (53) and fans after hitting a two-run home run against the Houston Astros in the second inning of a baseball game, Tuesday, Aug. 7, 2012, in Houston. (AP Photo/Pat Sullivan)
Washington Nationals' Danny Espinosa (8) is welcomed back to the dugout by bench coach Randy Knorr (53) and fans after hitting a two-run home run against the Houston Astros in the second inning of a baseball game, Tuesday, Aug. 7, 2012, in Houston. (AP Photo/Pat Sullivan)
