The overall leader knows that he has little to gain and much to lose.
They won all stages but one in a seven month tournament making them overall leaders by 135 points.
Armstrong started the day as the overall leader by four seconds.
The victory made him the overall leader in the 11-day stage race.
The pack, including all the overall leaders, finished 2:16 down.
He was among the overall leaders in several other categories.
Usually with the top order decided, the overall leaders do not try to win the final daily stage.
Indiana's Thomas was the overall leader for the night with 22 points.
Last Sunday, he won a stage and was among the overall leaders.
The main pack, including the overall leaders, was 20:35 behind.