Tonya Harding and Nancy Kerrigan
The 1992 Winter Olympics saw several excellent woman figure skaters don the red, white and blue, two of them being bronze-medalist Nancy Kerrigan and fourth place finisher Tonya Harding. Then in January 1994, Tonya's ex-husband and her bodyguard hired a goon to attack Nancy with a police baton. Whoops.
The thug just missed taking out Kerrigan's knee, but she had to back out of an upcoming competition that Harding then won, qualifying her for the 1994 Olympics, where she would once again be teammates with Kerrigan. While Harding maintained that she had nothing to do with the attack, it's safe to say that was a tense locker room.