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is young. In sports it's old,'' she said. ``But for whatever reason, I feel like I just never was really able to reach my full potential, and I feel like recently I just have been able to do a little better. I just keep trying to improve on everything.''
The Williams sisters were entered in the doubles but withdrew after Serena's singles match Friday, citing a leg left injury for Venus.
``I love playing doubles, love playing with Venus, but sometimes it doesn't work out,'' she said. ``I guess it's a relief, but like I say, we love to play doubles and we love to be out there ... so I'll definitely miss it.''
Rod Laver Arena was about three-quarters full for the match, though it was a quiet crowd _ people seemed to be expending more energy fanning themselves with programs and newspapers than applauding points on the court.
No. 9 Angelique Kerber advanced earlier with a 6-3, 6-4 win over American Alison Riske, and said her main aim had been to ``get off the court before it became really hot.'' Kerber will next play No. 28 Flavia Pennetta, who advanced 6-1, 7-5 over Mona Barthel of Germany.
No. 22 Ekaterina Makarova advanced with a 6-4, 6-4 win over Monica Niculescu and No. 30 Eugenie Bouchard beat American Lauren Davis 6-2, 6-2.
On the men's side, third-seeded David Ferrer advanced to the fourth round for a 10th consecutive Grand Slam when he beat No. 29 Jeremy Chardy 6-2, 7-6 (5), 6-2. The French Open finalists will next play Florian Mayer, who beat No. 20 Jerzy Janowicz 7-5, 6-2, 6-2.
Matches on outer courts were suspended for four hours on Thursday afternoon when the Extreme Heat Policy was invoked for the first time since 2009.