Lance Armstrong jumped into the lead of Tour of the Algarve with a 0.1 second time-trial victory in the fourth stage.
Armstrong: Strong favourite to win
The Tour de France champion led a US Postal sweep of the 24km leg between Vila Real de Santo Antonio and Tavira, clocking 31 minutes and 53 seconds.
US compatriot Floyd Landis was second with Colombian Victor Hugo Pena third.
Armstrong, 32, is competing in his first race of the season and will be the hot favourite to hold his advantage during Sunday's final stage to Malhao.
"I was surprised - I didn't expect to have such a good result," he said.
"The wind was in my face which is always dangerous. That's why I tried to hide myself as much as possible."
Armstrong was testing out a new bicycle, which he said would still need more "modifications".