United States' LaShawn Merritt celebrates with his country's flag after winning the gold medal in the men's 400-meter final at the World Athletics Championships in the Luzhniki stadium in Moscow, Russia, Tuesday, Aug. 13, 2013. (AP Photo/Matt Dunham)
Jamaica's Usain Bolt celebrates after winning gold in the Men's 100-meter final at the World Athletics Championships in the Luzhniki stadium in Moscow, Russia, Sunday, Aug. 11, 2013. (AP Photo/Alexander Zemlianichenko)
John Isner holds his shirt in his teeth during his match against Dmitry Tursunov, from Russia, at the Citi Open tennis tournament, Saturday, Aug. 3, 2013, in Washington. (AP Photo/Alex Brandon)
Russian opposition leader Alexei Navalny, right, and his former colleague Pyotr Ofitserov, left, are seen through a cage window in a courtroom in Kirov, Russia, on Friday, July 19, 2013. (AP Photo/Evgeny Feldman)