French teen Gael Monfils improved to 3-1 as a pro by upsetting 1999 Australian Open runner-up Thomas Enqvist 1-6, 6-4, 6-3 Monday in the first round of the Paris Masters. Monfils, 18, won three junior Grand Slam titles this season. His next match is against former No. 1 Lleyton Hewitt. ``I know what I have to do,'' Monfils said.