 Contador first took the race lead after the second mountain stage , to <unk> , by finishing nearly fifteen minutes ahead of previous race leader Gabriele Bosisio . The race 's overall classification had been headed for several days beforehand by Giovanni Visconti , who participated in a breakaway in the sixth stage which won him sufficient time to hold the race leader 's pink jersey for more than a week . In the race 's final week , Contador faced stern challenges from Riccò and defending Giro champion Danilo Di Luca . Though Contador did not win any stage , his performances were consistently strong enough to remain ahead through to the conclusion of the race . 
