Third-seeded Stanislas Wawrinka of Switzerland was among the first-round winners Tuesday in Buenos Aires, breezing past Italian Paolo Lorenzi.
Fifth-seeded Thomaz Bellucci survived a first-round challenge but No. 6 seed Fabio Fognini was bounced Tuesday and the Brazil Open.
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Rafael Nadal, making his return to competition after a seven-month absence, easily reached the semifinals Friday at the VTR Open.
Daniel Gimeno-Traver reached the quarterfinals of the VTR Open Thursday and set up a meeting with former world No. 1 Rafael Nadal.
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Former world No. 1 Rafael Nadal won in his first singles appearance since June, rolling to a second-round victory Wednesday at the VTR Open in Chile.
Two-time defending champion Novak Djokovic had little trouble in a straight-set, second-round victory Wednesday at the Australian Open.
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Two-time defending champion Novak Djokovic kicked off his 2013 Australian Open with a victory Monday and three other high seeds also won in straight sets.