December's theme is Sportsmanship, and Hall of Famer Kim Clijsters is well known for her kindness on and off the court. The 6-time major champion and 8-time WTA Sportsmanship Award winner shares how gratitude is one of the most important aspects of her career, and how keeping perspective was key to her reaching the top.

This episode is part of the International Tennis Hall of Fame's TennisWorthy short-form series. View more TennisWorthy stories at tennisfame.com/tennisworthy.