The San Diego Padres close out their Sunday home slate on September 20, 2026, hosting the Miami Marlins at Petco Park with first pitch set for 4:10 PM ET. Walker Buehler gets the ball for San Diego against Miami's Sandy Alcantara in a matchup that features two pitchers with genuine big-league pedigree. With the regular season winding toward its finish, every game in September carries weight, and the Padres will look to take care of business in front of their home crowd on Park Boulevard.

Pitching Matchup: Walker Buehler vs. Sandy Alcantara

This is the headliner. Buehler and Alcantara are both legitimate arms — the kind of starters who can keep a game tight and make lineup construction matter. Buehler, pitching for San Diego, will need to attack the zone and keep Miami's hitters off-balance early. Alcantara, a former NL Cy Young Award winner who built his reputation on durability and a mid-90s sinker, is capable of going deep into a game and suppressing a lineup on short rest or a full week of prep. Neither offense should assume runs come easy today.

San Diego Padres Starting Lineup

• Fernando Tatis Jr. — 2B
• Dustin Harris — RF
• Manny Machado — DH
• Ty France — 1B
• Jackson Merrill — CF
• Xander Bogaerts — SS
• Jake Cronenworth — 3B
• Samad Taylor — LF
• Ethan Salas — C

Keys to Watch for the Padres

Tatis Jr. Setting the Tone at the Top

Fernando Tatis Jr. leads off from second base, which gives San Diego a dynamic presence at the top of the order. If Tatis Jr. gets on base early and forces Alcantara to work, it opens the door for Machado and the middle of the lineup to do damage. A patient at-bat from Tatis in the first inning could change the entire complexion of the game.

Ethan Salas Catching Buehler

Keep an eye on Ethan Salas behind the plate. The young catcher handling a veteran like Buehler is a real storyline. Their communication and game-planning against a Marlins lineup that may not be fully known ahead of time will matter, especially in the middle innings when games tend to turn.

Jackson Merrill in the Five Hole

Merrill batting fifth in center field gives San Diego a potential run-producer in a spot where Alcantara might try to attack more aggressively. If Tatis, Harris, and Machado put runners on base, Merrill and France become the pressure points the Marlins have to navigate.

Prediction

This figures to be a low-scoring game given the quality of both starters. Alcantara will make it a grind, but Buehler pitching at Petco Park with a full lineup behind him is a situation that favors San Diego. The Padres' lineup has enough firepower in the middle — Machado, France, and Merrill — to scratch out two or three runs, and if Buehler is efficient through five or six innings, the San Diego bullpen can close it out. Padres win, 3-1.