Five-time Tour de France winner Lance Armstrong had to make do with fifth place in his season-opening Tour of the Algarve on Sunday.
Armstrong struggled to keep up with Landis on Sunday
Armstrong had gone into the fifth and final stage as the overall leader.
But he could only finish 34th, a full minute behind team-mate Floyd Landis, who went on to take overall victory in Portugal as a result.
Armstrong had looked in good form throughout the event, shining in the time trial the previous day.
Landis afterwards revealed Armstrong, his team leader, had given him the all-clear to go for victory.
"We have a strong team," said Landis. "Lance is generous, so he said I could go for the win if I was feeling well. Everybody worked together.
"It's good for the team to start the year with a win, so everybody's happy."