Rangers' Path to the Postseason: Sept. 30, 2012

ARLINGTON -- Rangers manager Ron Washington has only one television set in his office. On Saturday afternoon, the TV was tuned to a closed-circuit camera that shows the weather outside the Ballpark in Arlington.

He did not have the TV tuned to the Mariners-Athletics game during the rain delay that eventually postponed the Rangers game with the Angels. While the Rangers were waiting out the weather, the Athletics rallied for a 7-4 victory over the Mariners in Oakland.

The Mariners had a 4-2 lead into the ninth before Josh Donaldson tied it with a two-run home run. The Athletics won it in the 10th on Brandon Moss' three-run home run.

"I have no reaction," Washington said after the Rangers game was postponed. "I'm just concerned about the Rangers and the Angels."

The Rangers now lead the Athletics by 2 1/2 games going into a Sunday doubleheader with the Angels. If the Athletics lose on Sunday, the Rangers can clinch the division by sweeping the Angels.

Sunday's key games to watch (all times ET)

Angels (Greinke, 15-5) at Rangers (Darvish, 16-9), 1:05 p.m., Game 1 Preview >

Angels (Santana, 9-12) at Rangers (Holland, 11-6), 7:05 p.m., Game 2 Preview >

Mariners (Ramirez, 1-3) at A's (Milone, 13-10), 4:05 p.m. Preview >

If the postseason started today ...

This is how the teams would match up: Postseason Bracket »

Postseason 101

Magic numbers
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.

Tiebreaker scenarios
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