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Actor Robert DeNiro, left, chats with actor Billy Crystal before an NFL football game between the Dallas Cowboys and the New York Jets Sunday, Sept. 11, 2011, in East Rutherford, N.J. (AP Photo/Julio Cortez)

Actor Robert DeNiro, left, chats with actor Billy Crystal before an NFL football game between the Dallas Cowboys and the New York Jets Sunday, Sept. 11, 2011, in East Rutherford, N.J. (AP Photo/Julio Cortez)

9/11 sports tributes

The sports world paid tribute to the 10th anniversary of the 9/11 attacks.