Making history is nothing new for Thomas.
This will be a special moment for Thomas, a Brandon, Mississippi resident with three children, and a monumental postseason game for the entire NFL. "If I have a ponytail, you know, then I separate myself immediately". But she stressed that her focus was on "being the best official I can be".
Long before she suited up in stripes, Thomas was a college basketball standout and recalled her own brushes with the refs. "Field presence is what they talk about", she said in an interview with SB Nation.
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.
Sunday will mark the third playoff showdown between Patriots quarterback Tom Brady and his Chargers' counterpart Philip Rivers.
Terri Valenti was the replay official in Saturday's playoff game between the Chiefs and Colts, also a first.