Heriberto Hernández hit a walk-off grand slam on Sunday to give the Miami Marlins a 4-0 victory over the New York Mets [1], [2].

The win marks a significant momentum shift for Miami, as the team completed a three-game sweep of the Mets [3]. The result underscores the Marlins' ability to capitalize on late-game opportunities against a high-profile opponent.

The game remained a scoreless tie until the bottom of the ninth inning at loanDepot park in Miami, Florida [4]. With the bases loaded, Hernández connected on a 416-ft home run [5] that sailed over the fence to end the contest immediately.

This home run served as the first big-league walk-off hit of Hernández's career [1], [2]. The pitch was delivered by New York Mets pitcher Devin Williams, who was unable to prevent the rally that sealed the series loss for the visitors [6].

The final score of 4-0 [1] reflects the dominance of the Marlins' pitching staff throughout the series, which kept the Mets off the board until the final moments of the game. The three-game sweep [3] provides the Marlins with a critical series win as they continue their 2026 campaign.

The atmosphere at loanDepot park reached a peak as the ball left the bat, confirming a decisive end to the Sunday matchup [4]. The Mets now leave Florida having failed to score a single run in the series finale.

Heriberto Hernández hit a walk-off grand slam, giving the Marlins a 4-0 win.

This victory demonstrates the Marlins' ability to maintain defensive pressure over a full series while highlighting the volatility of the Mets' bullpen in high-leverage situations. A walk-off grand slam is a rare emotional and statistical peak that can shift the psychological dynamic of a season's mid-year stretch.