Baltimore Orioles first baseman Pete Alonso achieved a career milestone on September 15, 2026, hitting his 300th home run at Citi Field. The 360-foot blast came in the ninth inning of a game against his former team, the New York Mets, with the Orioles trailing 3-2. This marked Alonso's 124th home run at Citi Field, adding to his previous 123.

Despite the significant individual achievement, the Orioles ultimately lost the game to the Mets by a score of 7-5. Alonso triumphantly tossed his bat after the home run and completed a tour of the bases, later acknowledging the crowd with a curtain call. The event drew 28,097 spectators to Citi Field.

Baltimore Orioles first baseman Pete Alonso (25) watches his 300th career home run.

Alonso, who previously played for the Mets, was a notable figure at Citi Field during his tenure with the team. The home run was met with a mixed reaction from the crowd, acknowledging the player's past accomplishments while also supporting the current Mets team.