No trouble for Williams
Serena Williams eased into the fourth round of the Australian Open after a comfortable win over Daniela Hantuchova.
The world No 1 was not too troubled on another punishing hot day in Melbourne as she registered a 6-3 6-3 victory.
It was Williams' 61st win in the singles main draw at the Australian Open, more than any other woman.
There were reports that the 32-year-old had declined to do a TV interview after the match because she felt dizzy, but she denied that was the case.
Williams said: "I didn't feel dizzy. I had some pressing things I needed to take care of.
"I feel good to have got through that one because it was tough conditions out there, but I was happy to win."
Williams will now face Ana Ivanovic in the fourth round after the 14th seed rallied to oust home favourite Sam Stosur.
Ivanovic had lost the opening set on a tie-break before recovering to win 6-7 (10-8) 6-4 6-2.
Fourth seed Li Na survived a massive fright as she saved a match point en route to a gruelling three-set win over Lucie Safarova.
Last year's beaten finalist had to come from a set down and through a tiebreak to win 1-6 7-6 (7-2) 6-3.
Na will now face Ekaterina Makarova, a quarter-finalist for the last two years, after the Russian's 6-4 6-4 victory against Monica Niculescu.
Teenager Eugenie Bouchard continued her run with a dominant 6-2 6-2 victory over America's Lauren Davis.
It is the first time the 19-year-old Canadian, the WTA's newcomer of the year in 2013, has reached the fourth round at a grand slam - and her reward is a clash against Australian wildcard Casey Dellacqua, who registered a 6-2 6-4 win over Jie Zheng.
Ninth seed Angelique Kerber is also through after a 6-3 6-4 win over Alison Riske and next meets Flavia Pennetta, a 6-1 7-5 winner over Mona Barthel.