SYDNEY, Australia (AP) -- Martina Hingis completed a Swiss sweep of the Adidas International on Saturday, successfully defending her title with a 6-2, 6-3 victory over American Meghann Shaughnessy.

In the men's final, Switzerland's Roger Federer beat Argentine qualifier Juan Ignacio Chela 6-3, 6-3.

Hingis, a three-time Australian Open champion and runner-up last year, won her first WTA Tour title in 11 months. She recently returned to competition following an ankle injury.

``I think I surprised everyone by coming back and winning this tournament, but I surprised myself the most,'' she said. ``I feel good -- it was a legendary day.

``It's great to come back after having surgery, to win straight away ... it exceeded my expectations.''

The 21-year-old player from Switzerland withdrew from Friday's doubles final after suffering heat illness and aching in her legs during her singles semifinal win over Kim Clijsters -- her 500th career singles win.

But she showed no signs of pain in the final, dominating at the net and hitting 22 winners to 8 overall.

``I'm here, I'm ready and I'm back,'' Hingis said of her Australian Open preparations.

The draw for the Australian Open threw up a tough road for Hingis, who will have to beat Serena Williams, Venus Williams and defending champion Jennifer Capriati to win her first Grand Slam title since 1999.

She beat the Williams sisters in consecutive matches last year before losing the decider to Capriati.

Shaughnessy, who advanced on a walkover against Serena Williams, said Hingis was too good.

Williams, the No. 4 seed, quit their semifinal Friday while trailing 4-5. She'd turned on her ankle in the fourth game and had played for five games with strapping around the injury.

``I've had a good week but I'd have liked it to be a little bit better,'' Shaughnessy said. But, ``I got to play a lot of matches, which is a positive before a Grand Slam.''

Hingis broke in the second game and had a 3-0 lead before Shaughnessy held serve. The former No. 1 didn't miss a first serve in the first set, securing it on a service break in the eighth game.

The match was all over in 58 minutes when Shaughnessy sent a backhand long to give Hingis match point and then dumped her next backhand into the net.

Federer, seeded second, also won an ATP Tour event in Milan last season.

``I had a good week. I didn't expect to win this tournament because there was a lot of wind and I'm not a fan of that,'' Federer said. ``I'm very happy to start the year like this -- my tennis was fantastic.''

Americans Donald Johnson and Jared Palmer won the men's doubles final, beating Australians Josh Eagle and Sandon Stolle 6-4, 6-4.

The Australian Open begins Monday in Melbourne.