The 18-year-old became the first British women to reach the final 16 at the US Open since 1991 as she now focuses on her next opponent.
Robson was in fine form at the Louis Armstrong Stadium with a fantastic 6-4 6-7 6-2 victory over the 2011 French Open champion.
Speaking after the match, Robson, who also knocked out Kim Clijsters earlier in the tournament, said she knew that if she kept sticking with Li Na and playing her shots it might payoff for her and she is glad that the game plan paid off even though she lost the few break points she had had to the her much more experience opponent but she took her chance when it showed up.
Commenting on Li Na, Robson said she is a great hitter and she will have to go back to the gym to recover for her next match as she will now be facing Aussie Samantha Stosur in the next round.
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