Jason Collins Makes NBA History

A 10-day contract with the Nets makes him the first openly gay player in the US's 4 major pro leagues.
3:00 | 02/24/14

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Transcript for Jason Collins Makes NBA History
A history-making moment in the NBA. Jason Collins broke a big barrier when he became the first openly gay player in any of the four major pro leagues. John muller has more. Reporter: He played for just ten minutes. An historic moment at staples center as Jason Collins becomes the first openly gay athlete. Reporter: He hit the floor Sunday night as the first openly gay player in any of the nation's four major professional sports leagues. Signing a ten-day contract before the game. I don't have time to think about history right now. Collins remains in for brook Lyn Lyn. Can you believe it hasn't happened before you? That's kind of mind boggling. I never set out to be the first. Reporter: One person cheering on Collins Sunday, the man who could become the NFL's first openly gay player. Michael Sam, tweeting congratulations to my friend. Excited to see you do work out there. Sam telling reporters over the weekend, he's focused on winning, regardless of what teammates and critics might say. I know now handle myself. I know how to communicate with my teammates. The team got the win. That's the most important thing. That's all that I have ever cared about. I think ultimately it gets back to whether or not this person can help his team. Reporter: For "Good morning America," John muller, ABC news, New York.

This transcript has been automatically generated and may not be 100% accurate.

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