The seven-time Tour champion has struggled through a shaky start to his 2010 season, having been forced to withdraw from two races due to stomach ailments as well as the Tour of California after crashing midway through the race. On top of that, he has been dogged by doping accusations from former cyclist Floyd Landis. Still, Armstrong, who finished third in last year's race, remains one of the heavy favorites in his quest to win an eighth championship.
Text: Brett Logiurato, SI.com
Photo: Chris Graythen/Getty Images