MELBOURNE, Australia (AP):

Serena Williams frightened a few people, including herself. Defending champion Victoria Azarenka had a momentary lack of concentration. Two of the biggest names on the men's side at the Australian Open - Roger Federer and Andy Murray - had straight-set wins.

Day Two at Melbourne Park yesterday brought another day of perfect weather but a few anxious moments for Williams, who fell awkwardly on her right ankle in her 6-0, 6-0 win over No. 110-ranked Edina Gallovits-Hall.

Williams had the ankle heavily taped by trainers and was able to continue and still dominate the Romanian player. Later, she said she hoped to continue playing - she'll have a scheduled day off today, returning tomorrow to play her second-round match - and maintain her quest of winning her third Grand Slam tournament in a row and sixth Australian Open.

close call

"I think I was really, really close to panicking because a very similar thing happened to me last year, almost on the same side, the same shot," Williams said. "I just had to really remain calm and think things through."

She left little doubt she'll be back to play her second-round match tomorrow against Garbine Muguruza of Spain, who needed a 14-12 win in the deciding set to clinch her first-round match yesterday against Magdalena Rybarikova of Slovakia.

"Oh, I'll be out there," Williams said of her second-round match. "I'm alive. My heart's beating. I'll be fine."

Azarenka trailed 3-0 in the second set of her match with Monica Niculescu before levelling the set at 4-4 and winning 6-1, 6-4.

"I started well but I struggled a little in the second set," Azarenka said.

Told that her biggest threat on her half of the draw had injured her ankle, Azarenka wondered, tongue-in-cheek, how serious Williams' ailment could be: "I heard she won love and love, so what kind of injury are we talking about?"

confident murray

Murray, playing with more confidence since his US Open win in the final over Novak Djokovic that ended a 76-year drought for British men in majors, beat Robin Haase of the Netherlands 6-3, 6-1, 6-3. The second-seeded Federer defeated Benoit Paire of France 6-2, 6-4, 6-1.

Murray needed just 1 hour, 37 minutes, and Federer 1:23 in their first-round matches. They'll need to conserve their energy for a potential semi-final against each other to determine a final against top-seeded and defending champion Djokovic, assuming all three men are still around on the final weekend.

Before a ball was hit yesterday, players and officials were shocked to hear of the serious illness and pending resignation of ATP World Tour executive chairman and president Brad Drewett. The ATP said in a statement Tuesday that Drewett, a former player, has motor neurone disease, or Lou Gehrig's disease, but will continue in his role on an interim basis until a successor is found "in the near future".

Drewett has held the top ATP position since January 1 last year. The 54-year-old Australian was a top-40 singles and top-20 doubles player before he retired as a player in 1990.