In a discussion on Fox Sports Live, Andy Roddick says he and Novak Djokovic once got into a physical confrontation in the locker room. Roddick said it happened at the U.S. Open, presumably in 2008. Before his match against Djokovic that year, Roddick had been asked about the Serb's latest injury. At the time, Djokovic had developed a reputation for retiring frequently, and the American wondered in a joking manner if his foe might have "a back and a hip [injury]? And a cramp, bird flu or SARS?"