Witherspoon started playing tennis in the summer of 2002. Her daughter Jasi had taken a Ralleyball Program in March, and because she wanted to continue to play, Witherspoon decided it was a great way to bond with her. Tennis has become her passion, and her contributions to Middle Georgia Tennis include: Adult & Junior Program Coordinator, Tennis Instructor, Summer Camp Coordinator, and Tournament Director. March 2013, Witherspoon became the coordinator for the John Drew Smith Tennis Center.

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Between the fall of 2006 and spring of 2008, Witherspoon joined the faculty at Wesleyan College as a tennis instructor for beginners and intermediate players. She also co-coached the Wesleyan Tennis Team. She plays at the 4.0 level for USTA, and has also played ALTA. In November 2007, Sarah became a PTR certified associate instructor, and teaches at John Drew Smith and Tattnall Tennis Centers. Her main core of students are juniors.  She also hosts USTA tournaments for juniors.