San Francisco 49ers linebacker Chris Borland, center, during an NFL football game in Santa Clara, Calif. Borland announced that he will retire after just one season to protect himself from brain injuries. Marcio Jose Sanchez/AP hide caption

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Yoan Francisco, a rookie for the Havana Industriales, warms up before a game at Havana's Latin American Stadium. Cuban baseball has been facing hard times, but improved diplomatic relations with the U.S. have raised the possibility of increased cooperation and new opportunities. Eyder Peralta/NPR hide caption

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Philadelphia Eagles Chuck Bednarik (60) is victorious in an iconic 1960 photograph after making a sack vs. New York Giants Frank Gifford (16). Bednarik died on Saturday. He was 89. John G. Zimmerman/Sports Illustrated/Getty Images hide caption

itoggle caption John G. Zimmerman/Sports Illustrated/Getty Images