Nadal broke back and it looked headed for a tiebreaker until he wobbled in the 10th game on his own service, Soderling taking the opener as Nadal made two forehand errors from deuce.
In the tiebreak, Williams was struggling until nerves got the better of Li as she made a series of unforced errors and the top seed took advantage to close it out with a second-service ace after 58 minutes.
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