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

Once rivals on the tennis court, Martina Navratilova, left, and Chris Evert have become close friends in retirement. They are pictured above at the French Open in 1986.

They were the women's tennis champions of their generation. Now, Chris Evert and Martina Navratilova open up about friendship, cancer and retirement in the documentary Chris & Martina: The Final Set.

(Image credit: Trevor Jones)