AMPUERO, Spain -- Samuel Sanchez won the 13th stage of the Spanish Vuelta on Friday after Mauricio Ardilla misjudged the finish line, and Denis Menchov retained the overall lead in the
Ardilla was leading near the end of the 119.93-mile stage when he stopped pedaling and began to celebrate after believing he had crossed the finish line.
With a huge smile, Sanchez shot forward and won the stage in 4 hours, 3 minutes, 40 seconds. Menchov finished the stage in a tie for ninth.
"It was an unforgivable mistake, one learns from those and I hope never to repeat it," Ardilla said.
Oscar Pereiro finished second, with Ardilla third.
Defending champion Roberto Heras, who injured his left knee in a crash during the 12th stage, finished ninth.
The tour ends Sept. 18 in Madrid.