In 2007, she was the first woman to officiate a college football bowl game.
The 46-year-old's record-breaking achievement came Sunday when she took to the field at Gillette Stadium in Foxborough, Mass.to serve as down judge for the AFC Divisional Playoff game between the Los Angeles Chargers and the New England Patriots.
Thomas made history in 2015, when she was hired by the NFL to be the first full-time female officiant in league history. She will be the down judge in Sunday afternoon's contest.
DETROIT, MI - DECEMBER 11: NFL Line Judge Sarah Thomas walks on the field prior to the start of the game between the Detroit Lions and the Chicago Bears at Ford Field on December 11, 2016 in Detroit, Michigan.More news: Mookie Betts settles with Red Sox on $20M salary for 2019
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Thomas is no stranger to making history, having become the NFL's first full-time female official in 2015.
Thomas says she wants to focus on "being the best official I can be".
This will be a special moment for Thomas, a Brandon, Mississippi resident with three children, and a monumental postseason game for the entire NFL.
"You never expect it but when it comes, you definitely answer the call but I was just about speechless", Thomas said. "So tucking my hair, I blend in and I'm just another official".