( CNN ) -- Fabian Cancellara of Switzerland wins the prologue in 2012 Tour de France . Cancellara finishes seven seconds clear of race favorite Bradley Wiggins . Wiggins gains valuable time on defending champion Cadel Evans . Tony Martin of Belgium hit by puncture in around 6.4 km course in Liege .
Fabian Cancellara of Switzerland wins the prologue in 2012 Tour de France . Cancellara finishes seven seconds clear of race favorite Bradley Wiggins . Wiggins gains valuable time on defending champion Cadel Evans . Tony Martin of Belgium hit by puncture in around 6.4 km course in Liege .