New York Yankees relief pitcher Mariano Rivera tips his cap in the ninth inning of his final appearance in a baseball game at Yankee Stadium, against the Tampa Bay Rays on Thursday. Kathy Willens/ap hide caption

itoggle caption Kathy Willens/ap

Up close and personal: Cincinnati Reds second baseman Brandon Phillips, left, reaches back to tag out Houston Astros' Jonathan Villar during Tuesday's game in Houston. Pat Sullivan /AP hide caption

itoggle caption Pat Sullivan /AP

Oklahoma State players celebrate after a score during an Aug. 31 game against Mississippi State. Bob Levey/Getty Images hide caption

itoggle caption Bob Levey/Getty Images

Thomas Bach (right) has been chosen to succeed International Olympic Committee President Jacques Rogge (left). The pair are seen here at the IOC sessions in Argentina over the weekend. Alexander Hassenstein/Getty Images hide caption

itoggle caption Alexander Hassenstein/Getty Images

Serena Williams holds up the championship trophy after defeating Victoria Azarenka, of Belarus, during the women's singles final of the 2013 U.S. Open tennis tournament on Sunday in New York. David Goldman /AP hide caption

itoggle caption David Goldman /AP

The delegation of the International Federation of Associated Wrestling Styles celebrates as its sport is voted to be included in the 2020 and 2024 Summer Olympic Games. Scott Halleran/Getty Images hide caption

itoggle caption Scott Halleran/Getty Images

Junior Seau sustained many concussions during his career and was suffering from a degenerative brain disease when he killed himself in May 2012. Otto Greule Jr./Getty Images hide caption

itoggle caption Otto Greule Jr./Getty Images

Lydia Ko of New Zealand reacts as she birdies the final hole to win her second consecutive Canadian Women's Open Sunday. Because Ko is an amateur, she didn't receive the winner's check for $300,000. Stephen Dunn/Getty Images hide caption

itoggle caption Stephen Dunn/Getty Images

The knuckleball grip used by Boston Red Sox pitcher Steven Wright. Good fingernails are important. Marvin Fong /The Plain Dealer /Landov hide caption

itoggle caption Marvin Fong /The Plain Dealer /Landov

In its efforts to get the Oakland A's to relocate to their city, San Jose officials filed an antitrust lawsuit against Major League Baseball this year. The Oakland stadium is seen here in a file photo. Ezra Shaw/Getty Images hide caption

itoggle caption Ezra Shaw/Getty Images

Detroit Tigers shortstop Jhonny Peralta bats during the sixth inning against the Washington Nationals on Tuesday. Detroit fans watching game had the option of tuning in to a broadcast that lacked announcers, featuring only the sounds from the stadium. Carlos Osorio/AP hide caption

itoggle caption Carlos Osorio/AP