Former world number one Ana Ivanovic has been on a rollercoaster ride since reaching the top of the tennis world in 2008 but the 24-year-old Serbian is on the upswing after reaching the US Open quarter-finals today.
"It's amazing," the 12th-seeded Ivanovic said after a 6-0 6-4 win over unseeded Bulgarian Tsvetana Pironkova put her into a grand slam quarter-final for the first time in four years.
"I have been here in the fourth round quite a few times, so to make that step and reach the quarter-finals, and also the first time since '08, I'm very thrilled."
Ivanovic, now ranked 13th, will not have much time for celebration since her victory propelled her into a last eight encounter with red-hot Serena Williams.
The fourth-seeded Williams, riding high after a London summer that brought the 30-year-old American another Wimbledon title and Olympic gold in women's singles, charged along with a 6-0 6-0 walloping of Czech Andrea Hlavackova.
Ivanovic, who used a potent forehand to register 18 winners against Pironkova, said it was hard to explain her fade after starting the 2008 season with a runner-up showing at the Australian Open followed by triumph at Roland Garros.
"Like a rollercoaster," she said. "There were some good moments and some tough ones, but it's a process. I understand it better now.
"You can't have everything at the same time. You have to be consistent on practice courts and then in the matches. I felt I had that this year."
Ivanovic has lost all three previous meetings against Williams, including twice at the US Open. Last year, she fell 6-3 6-4 to the American in the last 16 at Flushing Meadows.
"I put myself lots of times in opportunities for the big matches and the big wins, and I never managed to do that. Now I have another chance, and I really hope I can pull it together this time," Ivanovic said.
Ivanovic said she has gained strength from childhood friend Novak Djokovic, who last year surged to the world number one with triumphs at the Australian Open, Wimbledon and US Open.
"We did speak a lot. He obviously had a great year last year. He's a dear friend of mine. It's great to get some experience from someone like him," said Ivanovic.
Ivanovic, who has recovered from a foot injury to stage her grand slam revival in New York, said she relished the chance to play Williams for a spot in the semi-finals.
"She's obviously a great player and she's been playing the best out of all the girls on tour at the moment," Ivanovic said.
"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 and try to enjoy it as well and enjoy the challenge."
Meanwhile, Italian Sara Errani reached the quarterfinals at a Grand Slam event for the third time this year, beating Angelique Kerber in straight sets.
The 10th-seeded Italian won 7-6 (5), 6-3. Before this year's Australian Open, she had never been past the third round at a major tournament.
Kerber made a surprise run to the US Open semifinals a year ago and had advanced to at least the quarters at the French Open and Wimbledon in 2012.
Errani, the runner-up at Roland Garros, needed nearly two hours to win in two sets.
The sixth-seeded Kerber double-faulted to end the first-set tiebreaker. She had 38 unforced errors.
When Kerber's final forehand bounced off the net cord and back, Errani dropped her racket and pumped both fists.
- Reuters, AP