Alberto Contador knows victory in the Vuelta a Espana is far from assured despite extending his lead with a win at stage 16.
The Spanish Tinkoff-Saxo rider broke away in the final four kilometres of Monday's ride from San Martin del Rey Aurelio to the Farrapona to increase his advantage over Alejandro Valverde (Movistar) to one minute 36 seconds.
Team Sky's Chris Froome, who is a further three seconds back in third, ran out of steam at the end of stage 16 and could only watch on as Contador streaked away.
However, despite his lead and strong form, Contador is not taking his third Vuelta crown for granted.
"I've not won the Vuelta but it's an important step forward," he said. "I could distance everybody and that makes me feel satisfied.
"Froome didn't just go for it once, it's hard to see because he attacks sitting down but he accelerated three or four times. But my legs could respond each time.
"It's been a good day. I saw Sky were working but I still thought I could do something.
"It's a relief to have gained some time...but it's not over yet, there are still five more difficult days. Anybody can have a bad day. I'm taking it step by step.
"I'm only thinking about my race, everybody else can think about their own."