Chris Carpenter and the Cardinals completed one of baseball's greatest comebacks, clinching the NL wild card Wednesday night with an 8-0 win over the Astros and a later loss by the Braves. The Cardinals got their playoff spot when the Braves fell to the Phillies 4-3 in 13 innings. St. Louis trailed Atlanta by 10 1/2 games on Aug. 25. The Cardinals won 23 of their last 31 games. The Cardinals will open the postseason on Saturday at NL East champion Philadelphia. In the other NL playoff matchup, Arizona visits Milwaukee.