Nadal, bidding to be the first man since Bjorn Borg to win the French Open and Wimbledon back-to-back, did not drop serve Saturday until 5-1 in the third set, when he was serving for the match.
The four-time French Open champion, and runner-up to Roger Federer at Wimbledon the last two years, held at love in his next service game to finish it off.
Other men’s winners included No. 8 Richard Gasquet, No. 12 Andy Murray, Janko Tipsarevic, Arnaud Clement and Rainer Schuettler, the oldest player left in the draw at 32. Murray, carrying Britain’s perennial hopes for a first homegrown male champion since 1936, had 15 aces in a 6-4, 6-7 (4), 6-3, 6-2 win over Tommy Haas.
The tournament has been jolted by a series of early upsets that have decimated the seeding lists.
Six of the top-10 seeded men have been knocked out so far before the fourth round: No. 3 Novak Djokovic, No. 4 Nikolay Davydenko, No. 5 Ferrer, No. 6 Andy Roddick, No. 7 David Nalbandian and No. 9 James Blake.
The No. 2 seeded Nadal, who lost to Federer in the last two finals, was dismissed Kiefer in straight sets to advance.
Roger Federer’s next opponent is 2002 champion Lleyton Hewitt — the last man to win the title before the Swiss star began his run of five straight championships.
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