Gwen Jorgensen, United States. Age at the Olympics: 26
Gwen Jorgensen was a virtual unknown in the sport when she finished second at the London Olympic test event last year with the fastest run split of the day. A sub-16-minute 5K collegiate runner at the University of Wisconsin-Madison, Jorgensen was discovered by USA Triathlon’s college recruitment program and had only competed in 14 international races before her breakout silver medal performance last year. Despite her lack of experience in the sport, Jorgensen’s stellar run speed makes her a legitimate podium contender this summer. But Jorgensen’s tendency to miss the first swim pack and relatively weak bike are vulnerabilities that her competitors could capitalize on.