This weekend, Jen Pawol will make history by becoming the first woman to umpire a Major League Baseball game. She's set to work the series between the Miami Marlins and Atlanta Braves.
The 48-year-old from New Jersey has worked spring training games over the last two years and in the minors since 2016.
Here's a look at other female officials who were the first on the floor, court or the field in prominent men's leagues.
NFL
Shannon Eastin became the first female official in NFL history when she was a line judge during a preseason game in August 2012 between the Green Bay Packers and the Chargers, who were then in San Diego.
A month later, she became the first woman to be an official in an NFL regular-season game when she worked as the line judge in the Rams-Lions game. Eastin was amon