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Kustok began her television career as an analyst and sideline reporter for ESPN and Fox Sports, covering college football, basketball (men's and women's), and high school football. She also worked as a TV sideline reporter for the Chicago Bulls, Blackhawks, Cubs, White Sox and Fire for Comcast SportsNet Chicago and was a substitute anchor for the network and filled in as sports anchor for WMAQ-TV. She has hosted College Sports Minute and was a freelance sports anchor/reporter for WFLD-TV. She also worked for Versus.She is the color commentator for the WNBA's Connecticut Sun home games. She also is the substitute anchor and contributor on FS1's First Things First. Kustok previously worked as a sideline reporter with the Brooklyn Nets (succeeding Michelle Beadle) before being promoted to TV analyst in 2017, making her the NBA's first ever female solo analyst. She also contributes to Nets Magazine.
Kustok grew up in Orland Park, Illinois, where she played high school volleyball and basketball. She later attended DePaul University, where she played on the Blue Demons women's basketball team. Her older brother, Zak, is a businessman who formerly played quarterback for the Northwestern Wildcats football team.
Sarah's father, Allan Kustok, has been tried for the shooting and killing of Anita "Jeanie" Kustok, her mother, while she slept in their home in 2010. Sarah testified before the jury and maintained her father's innocence in March 2014. Allan was convicted of murder in December 2014 and is currently serving a 60 year prison sentence.