After his third at-bat Thursday against the Arizona Diamondbacks, New York Mets rookie Pete Alonso decided to change his appearance, shaving his mustache during the game.

He struck out twice and reached on a throwing error before deciding to make a switch at Citi Field.

“I had very terrible at-bats before,” Alonso said. “And so I’m like, all right, mustache needs to go. Simple as that.”

Alonso hit his major-league-leading 46th and 47th homers Monday and ended Thursday hitless in his past 13 at-bats.

RELATED: Meet Home Run Derby Champ Pete Alonso’s Girlfriend Haley Walsh

The first baseman said it was not the first time he shaved in the middle of a game, noting: “Oh, yeah, baseball players are very superstitious.”

Flip the Page to see the New Look: