Reviewing MLB Playoff Picture 2026 and Most Pivotal Games to Decide Final Bracket

Of the 12 spots available for the 2026 MLB playoffs, six have been officially claimed.

That group includes three already crowned division winners in the NL (the Milwaukee Brewers, Los Angeles Dodgers and Atlanta Braves) and three different clubs hailing from the AL East (the Tampa Bay Rays, New York Yankees and Boston Red Sox).

That means there are—math majors in the crowd, say it with me—six spots and three division titles still up for grabs. And since the campaign closes on Sunday, Sept. 27, all of the undecideds will shift to the decided column over the next week.

Think of this, then, as the September preview of the October drama that makes baseball so great. While any number of outcomes could shift this race, let's take a closer look at three must-watch series that will prove more pivotal than most in determining these outcomes.

Guardians at Red Sox

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When these teams lock horns in Boston three times between Tuesday and Thursday, both will have plenty to play for. Now, that's technically more true for the Guardians, since the Red Sox have clinched a playoff berth and will most likely finish as the fifth seed, but they each have incentives in front of them.

As for Cleveland, it has a one-game edge on the Chicago White Sox for the AL Central crown. It also has built a three-game advantage on the Texas Rangers, which could be key in helping the Guardians secure a first-round bye.

An especially disappointing stretch in Boston, though, could send Cleveland into frightening territory, since it might mean losing hold of the division and feeling serious pressure in the Wild Card race. The Guardians only sit four games above the Houston Astros, who will close out the campaign against the Seattle Mariners (who are on the brink of elimination) and the Athletics (who've already been knocked out).

The Guardians must put their best foot forward here, and that starts Tuesday night when they'll hope Parker Messick can outduel fellow AL Rookie of the Year candidate Payton Tolle.

Brewers at Phillies

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The Brewers head into this Tuesday-Thursday series with the NL Central crown in hand, but the carrot at the end of their stick is nothing short of the league's top overall seed. Its theirs for now, but they only have a two-game edge on the Dodgers, so there's still work to be done.

The Phillies, meanwhile, have math on their side with a commanding four-game lead on the Diamondbacks for the NL's final Wild Card berth. That said, they haven't secured their spot just yet, and even if they do, they will be pushing more, since they're only a game back of both the Cubs and Padres.

But Philadelphia is finishing against two of baseball's four 90-plus-game winners (Milwaukee, then Tampa), and it hasn't exactly flashed its top form of late. The Phillies have lost or split their last four series, so the sustained success needed to improve their playoff positioning has eluded them of late.

Philadelphia has struggled to find quality with its bullpen of late, and injured starter Jesús Luzardo might be forced to handle a reliever role. That all puts a lot of pressue on the healthy starters in this rotation, starting with Zack Wheeler, who opposes Dustin May in Tuesday's series opener.

Diamondbacks at Padres

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This three-game bout between NL West rivals could be for all the proverbial marbles. Or it might be meaningless if San Diego's scorching hot offense pummels the Dodgers pitching, and the Diamondbacks get burried beneath a barrage of Rockies' runs in Coors Field.

Then again, it's not like anyone should ever pencil in wins over the Dodgers. And it's not like the Diamondbacks figure to fear a Rockies team that will stumble into that series having dropped 12 of their last 14 contests.

So, maybe this weekend showdown could be monumentally meaningful. There is a totally plausible scenario in which the winner of this series captures a Wild Card berth while the loser winds up watching the postseason like the rest of us.

If the baseball gods want maximum drama, they'll have this series carry maximum stakes into the final Sunday showdown between San Diego ace Michael King and Arizona's former All-Star Mike Soroka.