Quarter-final spot for Ivanovic
A review of Monday's action in the women's singles at the US Open, with wins for Ana Ivanovic and Serena Williams.
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Ivanovic reached her first Grand Slam quarter-final since winning the French Open in 2008 with a straight-sets victory over Tsvetana Pironkova at the US Open on Monday.
The Serb was expected to remain at the top of the game for many years after her triumph at Roland Garros but instead injuries and a crisis of confidence sent her tumbling back down the rankings.
She has been close to the last eight at a number of tournaments since without getting there but this time there was no stopping Ivanovic as she clinched a 6-0 6-4 win in an hour and 11 minutes.
Pironkova is more known for her exploits on grass having reached the Wimbledon semi-finals in 2010 and pushed Maria Sharapova in the second round this year.
The Bulgarian had lengthy treatment on her neck at the end of the first set and fought hard in the second but could not take the match into a decider.
Ivanovic now meets Serena Williams, who she has never taken a set off in three previous meetings, including in the fourth round here last year.
Ivanovic knows she will be a big underdog when she takes on Williams.
The 12th seed said: "Last year when I played her here, I thought I had some chances in the second set. But it's always tough.
"She's obviously a great player and I think she's been playing the best out of all the girls on tour at the moment. She's been having so many victories lately.
"Her serve is definitely her strength. I really have to be sharp from the first moment on and stay aggressive and stay in the moment. I'll try to enjoy it as well and enjoy the challenge. It will be a great opportunity for me."
Meanwhile, Williams sent an ominous warning to her title rivals with a 'double bagel' victory over Andrea Hlavackova .
In the first set Hlavackova was completely outplayed and won only 10 points but she never let her head drop and was close to winning a game on a number of occasions in the second set.
She even had her first break point when Williams served for victory but she could not take it and the 30-year-old wrapped up a 6-0 6-0 win after 57 minutes.
Williams hit 31 winners and made only seven unforced errors to set up a quarter-final clash against Serbia's Ana Ivanovic, who she has beaten in their three previous meetings.
Williams said: "Andrea played really well today, even though it was love and love. She never gave up so it was really important for me to stay super focused. I think I played really well today, I haven't played like this in the whole tournament."
Italy's 10th seed Sara Errani continued her annus mirabilis by knocking out sixth seed and last year's semi-finalist Angelique Kerber.
Errani had never been beyond the third round at a grand slam before reaching the quarter-finals at the Australian Open and she then embarked on a brilliant run through to the final at the French Open before losing to Maria Sharapova.
This was her first appearance in the fourth round at Flushing Meadows and she went in as the underdog but came out a delighted 7-6 (7/5) 6-3 winner.
Kerber, whose own stunning year began with last year's surprising run, fought back from 3-0 down to level at 3-3 in the second set but it was Errani who proved the more reliable in the end.
In the last eight, Errani will play her doubles partner and fellow Italian Roberta Vinci, who stunned second seed Agnieszka Radwanska 6-1 6-4.
The 29-year-old is also having the season of her life and reached the fourth round of a grand slam in singles for the first time at Wimbledon two months ago, while she and Errani won the doubles title at the French Open.
Vinci had never beaten Radwanska before, and she said: "I lost four times against her but today I played an unbelievable match. At the end it was like I was playing with my eyes closed. It was unbelievable.
"For sure an Italian goes to the semi-finals so I'm happy to play Sara. She's my best friend. I'm so pleased she won today."