Second-seeded Wozniacki and 2008 runner-up Jo-Wilfried Tsonga had to come back from big deficits. Wozniacki was 5-1 down and facing two match points in third set while Tsonga rallied from 5-2 down in the fifth set.
A dominant performance seemed to cast aside any doubts there may have been about Rafael Nadal's form brought about by last year's injuries.
Nadal fought back from two sets down and saved four match points in a 135-minute minute fifth set in which he successfully served to stay alive nine times, but it was not enough.
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