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Entertainer Jay-Z pins a September 11 commemorative ribbon on his shirt before an NFL football game between the Dallas Cowboys and New York Jets, Sunday, Sept. 11, 2011, in East Rutherford, N.J. (AP Photo/Julio Cortez)

Entertainer Jay-Z pins a September 11 commemorative ribbon on his shirt before an NFL football game between the Dallas Cowboys and 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.