Serena Williams and Maria Sharapova will renew their long and not-so-friendly rivalry after advancing to the semifinals at the Brisbane International, a key warm-up tournament for the Australian Open.

The pair played back-to-back quarterfinals on center court Thursday, with the third-seeded Sharapova beating 2012 Brisbane champion Kaia Kanepi of Estonia 4-6, 6-3, 6-2. She dropped three service games in the first set and another to open the second before finding her range and staging her comeback against the No. 30-ranked Kanepi.

The top-ranked Williams, the defending champion, was next on court and didn't lose a point on serve in the first set en route to a 6-3, 6-3 win over ninth-seeded Diminika Cibulkova of Slovakia.

Williams has a 14-2 record and 13-match winning streak against Sharapova dating back to the 2005 Australian Open semifinals, beating the Russian most recently in last year's French Open final.

Any friendship the pair had at that stage soured when they traded personal barbs relating to their romantic relationships ahead of Wimbledon, where Sharapova made an early exit. Sharapova only played one match after that in 2013 and spent the latter months of the season recovering from a right shoulder problem.

Williams, meanwhile, had a spectacular year, winning 78 of her 82 matches and capturing 11 titles, including two majors.

As far as any grudges go, Williams said Thursday: ''It's very difficult I think for anyone to be best buddies when you're so competitive.''

Sharapova didn't back away from the comments she made about Williams at Wimbledon in a New York Times profile last month, giving the impression that the relationship between the pair was still cold. On Thursday, she said she'd used the newspaper interview to ''clear the air.''

Asked how she'd describe their rivalry now, Sharapova replied: ''Well, I think I got to win a few times in order to call it rivalry.''

''I haven't had a lot of success against her,'' she added. ''It's the first tournament of the year. I came here wanting to play as many matches as I could and obviously wanting to play the best.''

Australian Open champion Victoria Azarenka was playing Stefanie Voegele of Switzerland in a late match, with the winner going into a semifinal against fourth-seeded Jelena Jankovic. The Serb beat fifth-seeded Angelique Kerber of Germany 6-7 (8), 6-3, 6-1.

In men's second-round matches, Romanian qualifier Marius Copil beat third-seeded Gilles Simon 7-5, 6-3 and will next meet former No. 1-ranked Lleyton Hewitt, who ousted No. 6-seeded Feliciano Lopez 7-5, 6-3.

No. 8-seeded Jeremy Chardy beat Nicolas Mahut 7-5, 6-7 (4), 6-3 and fourth-seeded Kevin Anderson withdrew due to a stomach ailment before his scheduled second-round match against Australian wildcard entry Sam Groth.

In other Australasian tournaments, Milos Raonic and Eugenie Bouchard combined to give Canada a 3-0 win over Italy at the Hopman Cup in Perth, and Venus Williams and Ana Ivanovic progressed to the semifinals at the WTA Tour's ASB Classic in Auckland, New Zealand.

Canada (2-1) maintained a chance of qualifying for Saturday's Hopman Cup final from Group A when Raonic beat Andreas Seppi 6-2, 6-4 and Bouchard clinched it when Flavia Pennetta retired with a right wrist injury while trailing 4-0 in the first set.

In Auckland, Venus Williams beat Garbine Muguruza of Spain 6-3, 6-3 and the second-seeded Ivanovic beat Kurumi Nara of Japan 6-2, 6-3.

Ivanovic will play her doubles partner, third-seeded Kirsten Flipkens of Belgium, in Friday's semifinals while Williams will play Jamie Hampton.

Flipkens beat Japanese qualifier Sachie Ishizu 6-4, 7-5 and the fifth-seeded Hampton beat Lauren Davis 6-2, 4-6, 6-4.

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