They were world-class tennis rivals. Now friends, they've teamed up against cancer

Chris Evert and Martina Navratilova, both 18-time Grand Slam champions and longtime rivals, are the subjects of a new documentary titled 'Chris & Martina: The Final Set.' The film explores their evolution from fierce competitors — first meeting in a 1973 match in Akron, Ohio, when Evert was 18 and Navratilova was 16 — to close friends in retirement. The documentary also addresses their personal battles with cancer and their lives after professional tennis.