The 2026 MLB postseason gets underway today, and with all four Wild Card Series playing best-of-three, every team on the schedule is one bad afternoon away from being done for the year.
Before getting into today's four series openers, check out our Kalshi review, and download the Action Network app for more picks and analysis throughout the playoffs.
MLB Prediction Markets on Kalshi
Prediction markets like Kalshi let traders buy and sell contracts tied to real-world outcomes, from who wins tonight's game to who wins the full series. Prices shift in real time as new information comes in — a pitching change, an injury update, a lineup swap — and they reflect where the crowd currently sees the odds. A price sitting near the middle points to a close game; a price pulling toward one side signals a clearer favorite.
Boston Red Sox vs. New York Yankees
This is the highest-volume matchup on the board, and it comes loaded with history. These two met in this exact round last year, and the Yankees became the first team to drop Game 1 of a Wild Card Series and still take it, closing things out behind Cam Schlittler's eight scoreless innings and 12 strikeouts in the decisive game.
Schlittler gets the ball again today, this time in Game 1, opposite Boston's Sonny Gray in a matchup between two of the American League's better arms this season. New York holds a real edge on the moneyline tonight, and that edge carries over cleanly to the full series price, so the two numbers agree with each other. The total is where things get more interesting: traders lean toward the under, which tracks given both starters' strikeout stuff and a Yankee Stadium crowd that figures to be loud from the first pitch.
Philadelphia Phillies vs. Atlanta Braves
Atlanta is a clear favorite to win tonight, but that confidence doesn't fully carry over to the series price, which sits much closer to even. That gap gets more interesting once you factor in Philadelphia's biggest question mark: Jesús Luzardo, working back from a shoulder issue that kept him out since early September, opens the game for the Phillies, and even the team isn't committing to how long he'll go — it could be one inning, it could be five.
That kind of uncertainty at the top of the game is exactly the type of thing that can pull the moneyline and the series price in different directions. Atlanta counters with a healthy, in-form Chris Sale, who has quietly built a 2.08 ERA against Philadelphia across four starts this season, right in line with his Cy Young-caliber year overall.
Chicago White Sox vs. Houston Astros
Houston earned the extra home game by winning the AL West, and traders actually like the Astros more across the full series than they do tonight specifically, the opposite pattern from the Phillies-Braves series above. That split makes sense: Houston's deeper roster and bullpen show up more clearly over three games than in one opener, where a good White Sox start can flip things quickly.
Chicago has been getting steadier, more consistent outings from Davis Martin down the stretch, giving them a real path to stealing Game 1 on the road, even with Houston favored on every number.
Chicago Cubs vs. San Diego Padres
It's a rematch of last year's Wild Card round, when Chicago eliminated San Diego in 3 games after the Padres forced a decisive Game 3. This time, the home field flips: San Diego hosts as the higher seed, a reversal from a year ago.
The moneyline and series price line up closely here, with San Diego favored in both, while the total sits about as close to even as these markets get, a sign traders expect a tight series between two teams that know each other well.
With 4 series opening on the same day and each one capable of wrapping up in a sweep, gaps like the ones above are worth tracking closely before first pitch.
