Career Highlights: A former world No. 1, Roddick will be a considerable underdog as he makes his second Olympic appearance. He was seeded second at the 2004 Athens Games and lost in the third round to Chile’s Fernando Gonzalez, also falling in doubles with Mardy Fish to the Indian duo of Leander Paes and Mahesh Bhupathi. Roddick skipped the 2008 Beijing Games in the aftermath of shoulder and neck injuries, choosing to instead prepare for the U.S. Open that year. It was at Flushing Meadows that Roddick won his lone Grand Slam title in 2003. He is a three-time Wimbledon finalist (2004, 2005, 2009) and reached the final of the 2006 U.S. Open, losing to Swiss star Roger Federer each time. Known for a booming serve that has clocked in at over 150 mph, Roddick has seen his form dip in the latter years of his career. There have been some positive signs in the form of a quarterfinal appearance at the 2011 U.S. Open and a victory over Federer in Indian Wells in March. With his serve a major factor at the All-England Tennis Club, there’s always a chance that Roddick can recapture his past glory and he remains a dangerous matchup on grass. He has also expressed an interest to play in the inaugural mixed doubles event with good friend Serena Williams.