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Brisbane - Serena Williams Thursday served a perfect first set on her way to setting up a blockbuster semi-final against bitter rival Maria Sharapova at the Brisbane International.
The top-seeded Williams did not lose a point on serve during the opening set during her comprehensive 6-3, 6-3 win over Slovakia's Dominika Cibulkova.
In stark contrast to Williams, Sharapova was forced to recover from an error-strewn start before eventually downing 2012 champion Kaia Kanepi in three sets 4-6, 6-3, 6-2.
The second semi-final will be between second seed Victoria Azarenka, who survived a second-set meltdown when she blew eight match points to beat Swiss Stefanie Voegele 6-4, 6-7 (7-9), 6-1, and fourth seed Jelena Jankovic.
Jankovic was a 6-7 (8/10), 6-3, 6-1 winner over Germany's Angelique Kerber.
Friday's semi-final between Williams and Sharapova will be the 17th meeting between the two superstars of the women's game, who make no secret of their frosty personal relationship.
Williams holds a clear advantage over the Russian, winning 14 times against Sharapova, including the last 13 in a row.
Their most recent clash was in the final of last year's French Open, where Williams won a tight battle 6-4, 6-4.
"Some of the matches were a bit closer than others," Sharapova said of her run of 13 losses.
"I know I've tried and I didn't succeed in the last many times that I've played her, but I'm setting up an opportunity to go out there and try to change that, and I'm going to try to do that."
Williams, who lost only four times in 2013, was in irresistible form against Cibulkova.
The world number one said she had been working on her serve in the off-season, but was still surprised at not losing a point in the first set for the first time since juniors.
"She (Cibulkova) was returning really well, she stays so low to the ground and does so many good things, especially off the ground. She's just so powerful," Williams said.
"So of all the opponents, I definitely wouldn't expect it against her. But I was able to serve really well today."
The defending champion was so focused beforehand she almost went on court without her racquets, with WTA supervisor Donna Kelso having to remind her to take them with her.
"I was just ready to get on this court, ready to play," a laughing Williams said. "I was just ready to get it started. I don't know -- I just forgot 'em."
Earlier, Sharapova and Kanepi appeared overcome by nerves at the beginning of their match.
Both players hit 23 unforced errors in the first set but Sharapova began to reduce her error rate in the second and found the length with her groundstrokes, breaking Kanepi twice to level the match.
She then raced away with the third in 33 minutes as her first service percentage lifted from 40 to 84, finishing the match off with her eighth ace.
"I think with every match I'm going to improve," Sharapova said.
"I didn't come here thinking from the first or second match I'm going to be playing my best tennis of the year.
"I'm happy that I improved towards the end of the match - not really happy with the way I started."
There was an upset in the men's draw as Romania's Marius Copil downed an out-of-sorts Gilles Simon 7-5, 6-3.
The third-seeded Frenchman made a host of errors against Copil, dropping serve once in each set to hand the match to his opponent.
Copil will play Australian favourite Lleyton Hewitt, who downed sixth-seeded Spaniard Feliciano Lopez 7-5, 6-3, while in an all French battle, eighth seed Jeremy Chardy beat Nicolas Mahut 7-5, 6-7 (4/7), 6-3.
Results of matches played at the Brisbane International tennis tournament on Thursday (X denotes seed):
Men
Second Round:
Lleyton Hewitt (AUS) bt Feliciano Lopez (ESP X6) 7-5, 6-3
Marius Copil (ROU) bt Gilles Simon (FRA X3) 7-5, 6-3
Jeremy Chardy (FRA X8) bt Nicolas Mahut (FRA) 7-5, 6-7 (4/7), 6-3
Women
Quarter-finals:
Victoria Azarenka (BLR X2) bt Stefanie Voegele (SUI) 6-4, 6-7 (7/9), 6-1
Jelena Jankovic (SRB X4) bt Angelique Kerber (GER X5) 6-7 (8/10), 6-3, 6-1
Serena Williams (USA X1) bt Dominika Cibulkova (SVK X9) 6-3, 6-3
Maria Sharapova (RUS X3) bt Kaia Kanepi (EST) 4-6, 6-3, 6-2
