Jason Collins, a veteran NBA center, has become the first male professional athlete in the four major American sports leagues to come out as gay. Collins wrote a first-person account posted Monday on Sports Illustrated's website. He finished this past season with the Washington Wizards and is now a free agent. Michael Dwyer/AP hide caption

itoggle caption Michael Dwyer/AP

After Metta World Peace's elbow connected with James Harden's head, the Oklahoma City Thunder guard (behind World Peace) crumpled to the floor. He was later able to walk off on his own power. Reed Saxon/AP hide caption

itoggle caption Reed Saxon/AP

After Metta World Peace's elbow connected with James Harden's head, the Oklahoma City Thunder guard (behind World Peace) crumpled to the floor. He was later able to walk off on his own power. Reed Saxon/AP hide caption

itoggle caption Reed Saxon/AP

Dirk Nowitzki of the Dallas Mavericks is defended by Joel Anthony of the Miami Heat during Game 5 of the NBA Finals at the AmericanAirlines Center in Dallas on Thursday (June 9, 2011). Mark Ralston /AFP/Getty Images hide caption

itoggle caption Mark Ralston /AFP/Getty Images