WATCH: Mattek-Sands does song challenge in Charleston

Bethanie Mattek-Sands never stands down to a challenge, of any kind. In Charleston, she accepted tournament director Bob Moran's task to slip in song lyrics during her rounds around the site.

Mattek-Sands did a great job, as expected, and had a blast with it. She's currently sidelined after having to have another knee operation, but is hoping to be back in time for Prague, where she'll reunite with her former doubles partner Lucie Safarova.

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Mattek-Sands is a former world No. 1 and has won eight doubles and mixed doubles Grand Slams.