Tennis starlet Laura Robson continued her giant-killing run at the US Open with a brilliant 6-4 6-7 (5/7) 6-2 victory over ninth seed Li Na to reach the fourth round. The 18-year-old had pulled off one of the results of the tournament in the second round by beating three-time champion Kim Clijsters, sending the Belgian into retirement, but this was even better. In the final set in particular, Robson outplayed one of the form players of the tour and last year's French Open champion to clinch victory. She becomes the first British woman to make the fourth round at a grand slam since Sam Smith at Wimbledon in 1998 and the first in New York since Jo Durie 21 years ago. Afterwards, Robson revealed her plan had just been to take on her shots. "I knew if I kept sticking with her and playing my shots it might pay off and it did," she told Sky Sports 3. "I had a few break points early on and I gave them up with average returning, so when I got a chance I knew I had to go for it. "She's a great hitter so knew I had to go for it, I'm going to go back to the gym and try to recover for the next match." Robson also put her stunning tournament so far down to her fitness levels. "I've been injured loads in the past and this is my first time injury free. That`s the biggest improvement and difference," she added. | 
