Serena Williams reached the third round of the Australian Open with a straight-sets win over Russia’s Vera Zvonareva.
The American top seed, 33, came through a tight first set to win 7-5 6-0 as the temperature reached 33C in Melbourne.
Two-time champion Victoria Azarenka defeated eighth seed Caroline Wozniacki 6-4 6-2.
Men’s top seed Novak Djokovic thrashed Andrey Kuznetsov 6-0 6-1 6-4 and defending champion Stan Wawrinka beat Marius Copil 7-6 (7-4) 7-6 (7-4) 6-3.
Battle of the former number ones
Victoria Azarenka was back to form after an injury-blighted season as she beat eighth seed Caroline Wozniacki.
After overcoming her fellow former world number one, the Belarusian will play Czech 26th seed Barbora Zahlavova in the third round.
There was no missing Azarenka, in bright yellow, as she dictated play from the baseline and wrapped up victory in 98 minutes.
The 2012 and 2013 champion broke the Dane twice in the second set and clobbered 31 winners in the match.
Williams sisters roll back the years
Serena and Venus Williams are back in round three of the Australian Open, 17 years after their first visit to Melbourne.
Venus, 34, beat Lauren Davis 6-2 6-3 to ensure both sisters will be involved in the last 32 on Saturday.
The pair first played at Melbourne Park in 1998, with Venus beating Serena in the second round.
“I just remember what a tough match [it was],” Venus said. “It was just relentless. I think it finally ended with a break in the third. That’s all I can remember.
“It was very tough I think for both of us. Neither one of us could get the upper edge. It was just a marathon.”
Watson progress in doubles
Heather Watson was back on court – the same court – 48 hours after losing in the singles, and requiring treatment from the doctor.
The British number one said on Tuesday she had struggled for energy but that she expected the issue to pass quickly, and so it appeared on Thursday.
Watson and her Russian partner Alexandra Panova, who held two match points against Maria Sharapova on Wednesday, fought through to round two of the doubles.
With the temperature nudging 34C, the pair led Shahar Peer and Annika Beck 2-6 7-5 3-1 on court 10 when the Israeli-German team retired.