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WATCH: MLB's first female umpire Jen Pawol checks Braves' Hurston Waldrep for illegal substances in 1st inning

Jen Pawol made baseball history on Saturday by becoming the first woman to umpire an MLB regular-season game, taking the post at first base during Saturday's matchup between the Miami Marlins and Atlanta Braves. The game is the first of a doubleheader the two teams will play.

After the top of the first inning, Braves rookie Hurston Waldrep became a part of the story as the first pitcher to be checked for illegal substances when he came off the field and walked toward the Atlanta dugout.

Waldrep retired the Marlins in order in the first, striking out Xavier Edwards and Kyle Stowers with his splitter before getting Agustín Ramírez to ground out.