Serena enters Australian Open quarter-finals after surviving Sabalenka test

Serena Williams stormed into the quarter-finals of the Australian Open with a gritty 6-4, 2-6, 6-4 victory over Belarusian Aryna Sabalenka.

Serena Williams celebrates her victory over Aryna Sabalenka.   -  AP

Serena Williams stormed into the quarter-finals of the Australian Open on Sunday with a gritty 6-4, 2-6, 6-4 victory over Belarusian Aryna Sabalenka.

The match was a big test for Williams, who was up against one of the few players on the women's tour capable of matching her power from behind the baseline.

"I'm happy to get through that one," Williams said in an on-court interview. "It wasn't easy and I knew it wasn't going to be easy. She was teeing off on every shot.

"Even the games that I lost were super close, one shot here and one shot there, and I just felt like, 'Serena you've got this, you've just got to keep going.'"

The players went toe-to-toe in an even first set until Williams pounced late to break Sabalenka for the first time and take a 1-0 lead.

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The roles were reversed at the start of the second, however, with Sabalenka breaking Williams in her first two service games.

The American, who is chasing a record-equalling 24th Grand Slam title, clawed a break back but was powerless in the face of Sabalenka's onslaught as the seventh seed broke once more for a 4-1 lead before sending the match into a decider.

"I lost the second set but the games were so close so I just tried to stay in there," Williams added.

With the pressure ramped up in the third it was Sabalenka who blinked first, making several errors on serve to hand Williams a 3-1 lead.

The Belarusian broke back and then levelled the set at 4-4 with a hold to love but the pressure finally told with Sabalenka serving to stay in the match trailing 5-4.

Sabalenka double-faulted to give Williams a 15-30 lead and netted a forehand to hand her two match points, conceding the match by sending a forehand long.

Halep battles past Swiatek

Second seed Simona Halep survived a first-set wobble to beat Iga Swiatek 3-6, 6-1, 6-4 in the Australian Open fourth round on Sunday as the Romanian avenged her shock defeat by the Polish teenager at the same stage of last year's French Open.

Swiatek, who knocked out Halep en route to her maiden Grand Slam title in Paris, used her booming groundstrokes to save two break points in the seventh game before immediately breaking the Romanian to love on her way to claiming the opening set.

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Halep roared back with an early break in the second set as her crafty baseline play frustrated her teenage opponent, who made a string of errors. The Romanian reeled off five consecutive games across the second and third sets before sealing victory in just under two hours at Rod Laver Arena.