Courchevel, France ? Two faces. One was Lance Armstrong’s, steely but almost serene as he pedaled furiously in the thin mountain air. The other was a mask of pain worn by Jan Ullrich, his great German rival trailing farther and farther behind.

Armstrong took a giant step toward a seventh consecutive Tour de France victory with a dominant ride Tuesday on the first Alpine climb of this year’s race, retaking the overall lead – which he could hold all the way to the finish July 24 in Paris.

At the top of the snaking, crowd-lined final climb to the ski station of Courchevel, the American was beaten to the line by Spanish rider Alejandro Valverde, a 25-year-old who Armstrong says could be the next big thing in cycling after Armstrong retires at the end of this Tour.

But the second-place finish was just fine. Riders Armstrong regards as his main threats, including Ullrich, were way behind, still laboring as he and Valverde clasped hands in the saddle in mutual recognition.

They covered the 111-mile 10th stage in 4 hours, 50 minutes, 35 seconds. Because of a protest at the start by farmers angry over wolf attacks on their sheep and cows, organizers shortened the race by more than nine miles, beginning it after the town of Froges, near the city of Grenoble.

Mickael Rasmussen crossed the finish line third and Spain’s Francisco Mancebo was fourth, both nine seconds back. Along with Valverde, they were the only riders who managed to stay with Armstrong on the final ascent.

The ride silenced doubts that Armstrong is too old at 33, or too jaded after his record six victories, to win again. If he follows the pattern of previous Tours, he might not relinquish the leader’s yellow jersey that he already wore for five days last week.

“Today, I had good legs,” Armstrong said. “We are in a good position with regard to some of the main rivals, so we’ll have to protect that and that might mean protecting the jersey and hopefully retiring in it. But we’ll see, there’s still a lot of racing to go.”

Overall, Armstrong leads Rasmussen by 38 seconds. While he does not regard himself as a challenger to Armstrong, the Dane has shown himself enough of a threat on climbs – he won the ninth stage with a gutsy solo ride over six ascents – to warrant the Texan’s attention.

“He’s a damn good climber, and we have to watch him now,” Armstrong said.

Italian Ivan Basso, among the challengers left behind by Armstrong on the 13.8-mile final ascent, was 1:02 behind in fifth place Tuesday – his overall deficit to Armstrong growing to 2:40.

A spectator waves a U.S. flag as Lance Armstrong, followed by Mickael Rasmussen, leads the ascent to Courchevel during the 10th stage of the Tour de France. Armstrong was second on the stage Tuesday and retook the overall lead.

Ullrich, the 1997 winner and a five-time runner-up, dropped behind about halfway up the climb, grimacing and puffing, when Armstrong’s new Ukrainian teammate Yaroslav Popovych upped the already punishing pace – shaking off a tumble earlier in the stage when he collided with a car from rival Team CSC.

“He REALLY accelerated,” Armstrong said. “That was a sprint. He had a serious crash and came back and didn’t even think about it.”

Ullrich, perhaps feeling the effects of a crash of his own in the ninth stage, struggled to the finish line in 13th place, 2:14 back, his overall deficit to Armstrong growing to 4:02. Ullrich’s teammate, Andreas Kloeden, runner-up last year when Armstrong won his record sixth crown, fell to 4:16 behind overall.

The biggest surprise was the collapse of Alexandre Vinokourov, another Ullrich teammate from Kazakhstan who had been expected to challenge Armstrong but who trailed Tuesday by 5:18 in 24th place. Vinokourov, third in 2003, is 6:32 back of Armstrong overall.

Valverde, racing his first Tour, is 3:16 behind Armstrong.

“A guy like him – I’m not blowing smoke – could be the future of cycling. He’s a complete rider, a smart rider and a patient rider,” said Armstrong, who added that he “gave everything I had” to try to beat the Spaniard in the final sprint.

“I attacked and couldn’t go any harder, he’s a fast guy,” he said.