Freddie Freeman hit the first walk-off grand slam in World Series history as the Los Angeles Dodgers defeated the New York Yankees in overtime in game one at Dodger Stadium.

With the teams tied at 2-2 after nine innings, British international Jazz Chisholm Jr led a Yankees rally and gave them a slim lead in the top of the 10th.

But with the Dodgers down to their final out, the Yankees’ decision to intentionally walk the dangerous Mookie Betts, loading the bases for Freeman, backfired spectacularly.

The first game of the best-of-seven series started as a pitching duel as Dodgers starter Jack Flaherty and Yankees ace Gerrit Cole dominated.

The hosts broke the deadlock in the bottom of the fifth inning when Enrique Hernandez, only the second Dodger to reach base in that stretch, raced home on a sacrifice fly by Will Smith.

The Yankees, in their first World Series since 2009, bounced right back when Giancarlo Stanton lifted Flaherty for a two-run homer.

Both sides squandered opportunities by stranding baserunners, but the Dodgers tied the game after Japanese superstar Shohei Ohtani doubled to center field in the eighth, advanced to third on a fielding error and Betts’ sacrifice fly drove him in.

The Yankees thought they had regained the lead in the ninth when Gleyber Torres went deep to center field, but when a supporter reached out to grab the ball before it hit the wall, a ruling of “fan interference” was upheld after a video replay. and Torres was sent back to second base.

Yankees talisman Aaron Judge, who had a disappointing night with three strikeouts, then stranded two runners as extra innings loomed.

In the 10th, Chisholm stole two bases before Anthony Volpe drove him in to make it 3-2.

Back came the Dodgers, with two men on base and the script certainly written for an Ohtani walk-off, but after botching his lines, Freeman put the seal on a memorable play.

The series continues on Saturday at the same location, after which it moves to New York on Monday.