Madrid: Chinese tennis star Li Na was forced to dig deep in order to defeat No.16 seed Sloane Stephens 2-6, 6-3, 6-2 in two hours and move into the quarterfinals of the WTA Madrid Open here Thursday.
Despite her progress, Li Na was not satisfied with her performance in which she made over 40 unforced errors, reports Xinhua.
The first set saw Li Na play her worst tennis since arriving at Madrid. Perhaps unhappy at her third consecutive early start, the World No. 2 was never able to find her rhythm on court and while struggling with her own serve, she also failed to deal with that of her rival.