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Samantha Stosur Image Credit: AP

New York: Defending champion Sam Stosur ended the giant-killing run of 18-year-old Briton Laura Robson with a hard-fought 6-4, 6-4 win in the fourth round of the US Open on Sunday.

The Australian came from a break down to win the first set and held off a late fight-back by Robson in the second to advance to the last eight after one hour, 38 minutes.

Robson saved eight match points as she came from 5-2 down to get back on serve, but Stosur broke again to clinch victory and a match with top seed Victoria Azarenka.

“On the match points I probably had a few flashbacks to a few matches last year, when I had match points and couldn’t close it out,” Stosur said.

“But I thought it was a good match and I played pretty well. Towards the end, I probably stepped it up another gear. It was a really good match and definitely one that I needed going to the quarters.”

Robson had beaten Kim Clijsters and Li Na to make the fourth round and showed why as she crunched a few groundstrokes to break serve in the third game.

Stosur said she had tried to vary her serve to keep the hard-hitting Robson off balance. “I’ve been serving very well out in all my matches, but I really did want to try and mix up my serve today and not let her get grooved,” she said.

“She’s a very good ball striker. You give a player like her the same shot over and over, eventually you’re going to get burned.”

Robson will rise from 89th to around 75th in the rankings after her run to the fourth round but said she had believed she could have gone further.

“I’m definitely disappointed,” the former Wimbledon junior champion said. “I felt like I didn’t play as well as I did in my last three matches. I just hit too many unforced errors.

“Sam is someone who sort of makes you feel like you’re playing bad because she hits it with so much spin, so it’s hard to get her serve back sometimes.

“But it’s been a good tournament for me.”

The $120,000 (Dh440,754) for reaching the fourth round is the biggest payday of Robson’s career to date and said she intended to spend some of it on Monday.

“I’ll go home and train for a week before I go out to Asia [for a series of tournaments],” she said. “But I think I’ve got tomorrow off to do some shopping.”

Stosur has struggled to get the better of Azarenka and admitted she will need to play her best if she is to continue the defence of her title.

“You’ve got to give it everything you’ve got,” she said. “I have not done well against her in the past. There’s a few things I’ve learned over those last few matches.

“Hopefully I can put all those into play, have a better match and hopefully a very good one.”