Seventh-seeded Pablo Andujar of Spain advanced but former world No. 5 Tommy Robredo fell Monday in opening-round play at the Brazil Open.
Ryan Sweeting began his defense of the U.S. Men's Clay Court Championships with a first-round win over Ricardo Mello Tuesday.
Filippo Volandri of Italy beat seventh-seeded Albert Montanes in straight sets Monday in the first round of the Brazil Open.
World No. 1 Novak Djokovic opened defense of his Australian Open title with a dominant straight-set victory Tuesday.
Bulgarian teen Grigor Dimitrov and Pablo Cuevas of Uruguay advanced with wins Monday in first-round play at the U.S. Men's Clay Court Championship.
Juan Martin del Potro was among the first-round winners Wednesday at the Sony Ericsson Open, winning for the 10th time in his last 11 matches.
Top-seeded Nicolas Almagro overcame a slow start Friday to defeat Juan Ignacio Chela and earn a spot in the championship match of the Brazil Open.
James Blake and David Nalbandian both won in straight sets Friday, advancing to the second round of the BNP Paribas Open.
No. 1 seed Juan Carlos Ferrero coasted into the semifinals of the Brazil Open Friday, rolling past qualifier Carlos Berlocq in straight sets.
Second-seeded Albert Montanes of Spain won his opening match Monday in the Brasil Open, topping Simon Greul of Germany in straight sets.