Jason Collins, who played for the Boston Celtics in 2012, signed a 10-day contract with the Brooklyn Nets on Sunday. Collins came out as gay in an article in 2013. Bruce Bennett/Getty Images hide caption

itoggle caption Bruce Bennett/Getty Images

Jason Collins (left), then of the Washington Wizards, during a game this month against the Chicago Bulls. Jim Young /Reuters /Landov hide caption

itoggle caption Jim Young /Reuters /Landov