The Braves also lowered their magic number for clinching home field in the NL Wild Card game to three. They lead the Cardinals by 5 1/2 games for the first NL Wild Card spot.
Wednesday's key games to watch (all times ET)
Dodgers (Harang, 9-10) at Padres (Richard, 14-12), 6:35 p.m. Preview >
Nationals (Lannan, 3-0) at Phillies (Kendrick, 10-11), 7:05 p.m. Preview >
Marlins (Johnson, 8-13) at Braves (Maholm, 12-10), 7:05 p.m. Preview >
Brewers (Marcum, 5-4) at Reds (Arroyo, 12-8), 7:10 p.m. Preview >
Pirates (Locke, 0-2) at Mets (Hefner, 2-7), 7:10 p.m. Preview >
Cardinals (Carpenter, 0-0) at Astros (Norris, 5-13), 8:05 p.m. Preview >
D-backs (Miley, 16-10) at Giants (Cain, 15-5), 10:15 p.m. Preview >
If the postseason started today ...
This is how the teams would match up: Postseason Bracket »
To calculate a team's magic number, take the number of games it has remaining and add one. Then subtract the difference in the number of losses between that team and its closest pursuer.
A tiebreaker game will be played to determine a division winner, even if the tied clubs are assured of participating in the postseason. If a division championship tiebreaker is necessary, the head-to-head record between the clubs will determine home-field advantage. If the head-to-head record is tied, then the division record will be the next tiebreaker.
If two clubs are tied for the two Wild Card berths, home-field advantage will be determined by the head-to-head record between the clubs. If the head-to-head record is tied, then the division record will be the next tiebreaker.
Tiebreaker rules »
2012 postseason schedule
Wild Card playoff games: Oct. 5
Division Series: Oct. 6-12
AL Championship Series: Oct. 13-21
NL Championship Series: Oct. 14-22
World Series: Oct. 24-Nov. 1