Nine of Oakland's final 12 games come against playoff hopefuls, and seven of them are against division-leading Texas. The Rangers' lead on the A's remained at four games, following Texas' loss in Seattle.
Saturday's key games to watch (all times PT)
A's (Blackley, 5-3) at Yankees (Nova, 12-7), 10:05 a.m. Preview >
Orioles (TBA) at Red Sox (Cook, 4-10), 10:10 a.m. Preview >
White Sox (Quintana, 6-4) at Angels (Haren, 11-11), 6:05 p.m. Preview >
Rangers (Harrison, 17-9) at Mariners (Beavan, 9-10), 6:10 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
Steven Miller is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.