There's only one week left for teams to make their postseason push -- and you can watch the biggest games for free on MLB.TV.

Four games with huge playoff implications will be streaming for free on MLB.TV starting tonight. Fans can watch by going to MLB.com/FreeGame.

The four matchups could help decide more than one playoff race: A's-Mariners tonight, Phillies-Braves on Thursday, Brewers-Dodgers on Friday and Rays-Yankees on Saturday.

• Watch MLB.TV Postseason Push

Here's what's at stake in each game of MLB.TV's Postseason Push special.

Monday, Sept. 27: A's at Mariners, 10:10 p.m. ET

The A's and Mariners are both just barely on the outside looking in in the American League Wild Card race. The Mariners (86-70) are two games behind the Red Sox (88-68) for the second AL Wild Card spot, and the A's (85-71) are one game behind Seattle. This series could push one AL West team back into the playoff picture and the other out of the running.

Thursday, Sept. 30: Phillies at Braves, 7:20 p.m. ET

The Braves and Phillies are jockeying for the National League East crown, and they go head to head this week. Atlanta, at 83-72 entering the series, is 2 1/2 games up on Philadelphia (81-75). Watch Freddie Freeman lead Atlanta against Bryce Harper and the Phils in Thursday's series finale.

Friday, Oct. 1: Brewers at Dodgers, 10:10 p.m. ET

The Dodgers have won 100 games this season … and they're in second place. But a division title is still within reach. Los Angeles (100-56) entered the weeks only two games behind the Giants (102-54), and avoiding the winner-take-all Wild Card Game would be huge. To catch San Francisco, the Dodgers might have to beat the NL Central-champion Brewers in their final regular-season series. Watch ace Clayton Kershaw take the mound in the series opener for free.

Saturday, Oct. 2: Rays at Yankees, 1:05 p.m. ET

The Rays have clinched the AL East, but this rivalry series to close out the season could have big implications for the Yankees in the Wild Card race. The Yankees (89-67) entered the week in the top Wild Card spot by a game over the Red Sox, but they're about to play a rival contender, the Blue Jays (87-69), who are just a game back of Boston and two back of New York. Then comes this series at Yankee Stadium against the division champs. Aaron Judge, Giancarlo Stanton and the Bronx Bombers might have to outslug the Rays to get into the playoffs.