Britain's Tim Henman knocked out fourth seed Sjeng Schalken of the Netherlands 6-2, 2-6, 6-2 on

Wednesday to book a place in the quarterfinals of the indoor CA Trophy.

Playing in his first ATP tournament since losing in the first round of the US Open in August, Henman stormed through the first set, using his trademark chip and charge game to full effect against a stunned Schalken.

Schalken woke up in the second set and began to put pressure on Henman on his serve. But Henman, a winner here three years ago, came back with a vengeance in the third set and broke the Dutchman's serve twice to secure the match.

"I'm really pleased with my overall performance -- Sjeng's a good player so it's a good boost for my confidence and another match under my belt," Henman said.

"In the second set I was too aggressive and made too many unforced errors, but I got the balance right in the third set where I was more patient and served well," he added.

The unseeded Briton next plays either eighth seed Albert Costa or Jonas Bjorkmanin thelast eight.

In first-round action, second seed Carlos Moya shrugged off the loss of a tight second-set tie-break to overcome Chile's Fernando Gonzalez 6-4, 6-7, 61.

"He's a dangerous player, but my serve was working well and I was mentally very focused," the Spaniard said.

A strong showing in Vienna is important if Moya wants to remain in contention for one of the last three spots at the Masters Cupin Houston next month.