San Antonio Spurs forward Tim Duncan celebrates with his teammates after defeating the Miami Heat in game five of the NBA finals in June. Ashley Landis/EPA/Landov hide caption

itoggle caption Ashley Landis/EPA/Landov

Florida State fans cheer Rashad Greene after a 74-yard touchdown pass in the fourth quarter of an NCAA college football game against Clemson in Tallahassee, Fla., on Sept. 20. In college sports, African-American student athletes and white student audiences are the norm. Commentator Frank Deford asks why this dynamic does not make us more squeamish. Mark Wallheiser/AP hide caption

itoggle caption Mark Wallheiser/AP