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ALTO HAZALLANAS, Spain -- Christopher Horner of the United States won the 10th stage of the Spanish Vuelta on Monday to take the overall lead for a second time.
The 41-year-old RadioShack-Leopard rider also won the third stage. Organizers said he became the oldest rider to earn a stage victory in one of cycling's three grand tours, which also include the Tour de France and Giro d'Italia.
Horner broke away on the steep, zigzagging ascent to the Alto Hazallanas peak at the end of 116-mile mountainous ride from southern Andalucia. He won in 4 hours, 30 minutes, 22 seconds.
Vincenzo Nibali pursued Horner but was unable to catch him. He finished 48 seconds behind in second, with Spain's Alejandro Valverde leading a small pack that was 62 seconds back.
"This race was a lot of work for me," Horner said. "When Nibali began to accelerate on the final climb I thought to myself it was the moment for me to attack and maybe win the race, which I did."
Said Nibali: "It was a very hard stage because it was so hot at the beginning of the race. Later, I had Horner ahead of me with close to a 40-second lead and it was too difficult to catch him. But it's fine like this because there is still a lot of road ahead and tomorrow is a rest day."
Horner had predicted that he would attack toward the end to try to reclaim the overall lead, and he had placed himself well within the leading pack after the tough category 1 climb up Altos de Monachil, a 4,806-foot ascent, about 17 miles from the finish line.
The race resumes Wednesday with a 24-mile time trial in and around the central city of Tarazona.