Pete Alonso Hits 300th HR vs Mets

Pete Alonso launched his 300th career home run Tuesday night at Citi Field, a game-tying solo shot in the ninth against his former New York Mets, and Coby Mayo's three-run inside-the-park homer in the 11th carried the Baltimore Orioles to a 7-5 win. ESPN, the Associated Press, and Sportsnet all tracked the milestone and the wild finish.

Alonso was hitless in his first seven plate appearances of the series before he crushed a 414-foot drive off Kodai Senga with one out in the ninth, tying the game at 3. He spiked the bat toward the Orioles dugout, rounded the bases, then took a curtain call as Mets fans chanted his name. Chants of "Fire Stearns" followed for Mets president of baseball operations David Stearns.

History against his old club

Alonso hit a club-record 264 home runs for the Mets before signing with Baltimore last December. He became the third player to hit his 300th homer against a team for which he played 1,000 or more games, joining Willie Horton and Torii Hunter.

Three Long Island fans, Michael Shaw, Nick Maldarella, and Chris Makarius, teamed up to catch the milestone ball after it caromed off the second deck in left. Alonso signed bats, balls, and shirts for them outside the visitors' clubhouse and offered Camden Yards tickets and batting-practice access next season.

Christian Encarnacion-Strand and Jeremiah Jackson also homered for Baltimore (74-78), which stayed three games behind Cleveland for the last American League playoff spot. New York (69-82) lost its third straight and locked in a losing season.

Mayo's inside-the-parker seals it

The clubs traded runs in the 10th. In the 11th, Mayo connected on an 0-2 pitch from Jonathan Pintaro. The ball glanced off rookie A.J. Ewing's glove as Ewing crashed into the center-field wall, then rolled free so Mayo could score standing up. Alex Hoppe got the win. Andrew Kittredge earned his 10th save.

Sean Manaea, who started for New York, said he had respect for Alonso but called the opposing-player curtain call "crazy" given how hard the 2026 Mets have worked through an underwhelming year. Alonso thanked the crowd for years of support and said the dugout pushed him to tip his cap. Both quotes are part of the same night: a Queens love letter and a visitor's clubhouse party after Mayo's inside-the-parker.

Orioles fans get a polar-bear milestone and a playoff-race survival night in one box score. Mets fans got one more memory of Alonso, then another loss. Chris Bassitt draws the series finale Wednesday against Robert Stock with Baltimore still hunting every half-game.

Three hundred. Curtain call. Then Mayo ran forever. That is the Citi Field story.