When it mattered most,Grant Preston Louis Lappe shined like a major league star.

In a tie game in the final inning of the Little League World Series championship game, the El Segundo, California, shortstop connected to send the ball past the left field wall for a walk-off home run to win the title in the moment of a lifetime.

It was a thrilling end to another magnificent tournament in Williamsport, Pennsylvania, as Curacao came back from a four-run deficit in the top of the fifth with a grand slam to tie the game at 5 apiece. But ultimately, California held off Curacao, 6-5, on August 27 to put an end to the thrilling 11-day tournament.

Lappe, who recorded five RBI and allowed one run in 5 1/3 innings in the U.S. championship win against Texas, entered Sunday as the home run leader of the tournament.

Curacao had not allowed a home run all tournament, but Lappe changed that with his moonshot in the bottom of the sixth. It was his fifth home run of the tournament.

Lappe celebrated while rounding the bases and his teammates mobbed him at home plate.

"My mentality was just get the next guy up and if we kept doing that, we would’ve won either way. But I’ll take the homer," Lappe said after the game.

The championship for El Segundo is the eighth time a California team has won it all, the most of any U.S. team. It's also the first championship for the state since 2011 when Ocean View Little League from Huntington Beach, California, brought home the title, and the fifth consecutive tournament a U.S. team won.