Working out has given Lindsay Davenport a newfound confidence at Wimbledon. The 1999 champion reached the quarterfinals on Monday by beating No. 15 Kim Clijsters 6-3, 6-7 (4), 6-3. Clijsters double-faulted three times in the final game, including on match point, then slammed her racket to the grass. ``She puts you under so much pressure,'' Clijsters said.