Continued: Cancellara wins Tour's 1st stage; Armstrong 10th

Contador led four Astana riders into the top 10. Andreas Kloeden of Germany was fourth, American Levi Leipheimer was sixth and rival Armstrong was 40 seconds back in 10th.

Contador got an edge on other title hopefuls. Two-time Tour runner-up Cadel Evans of Australia was 23 seconds behind Cancellara in fifth and Giro d'Italia winner Denis Menchov was 1:31 back in 53rd place.

Carlos Sastre, the reigning Tour champion, was 1:06 behind Cancellara. The 34-year-old Spaniard wanted to wear the yellow jersey, his team said, but Tour organizers have ended the tradition of letting the previous year's champion ride in it for the start after Floyd Landis was stripped of his title in 2006 over a doping scandal.

Much has been made of Armstrong's rivalry with Contador, who also stands a chance to become one of cycling's greatest riders. He has already won each of the Grand Tours of France, Italy and Spain — a feat accomplished by only five riders, and not Armstrong.

On his Twitter account, Armstrong hailed Leipheimer's "awesome" ride, but he didn't give an immediate reaction about the performance of Contador.

Armstrong, who rode 18th among the 180 riders to leave the start ramp, took the provisional lead early — baring his teeth and pedaling up out of the saddle as he neared the finish.

Only 15 riders later, Tony Martin of Germany outpaced him. Others also soon bettered Armstrong's time, including Leipheimer and Liquigas rider Roman Kreuziger.

"Kreuziger just moved into 2nd. I raced with his dad! Haha," Armstrong tweeted.

It was clearly an older Armstrong, not the Armstrong of old.

During his reign as Tour champion, Armstrong never finished lower than third in a time trial, except once, when he placed seventh in one in 2003.

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