Rafael Nadal is not sure how his injured left knee will respond to his first hardcourt match of the year at the BNP Paribas Open.
Rafael Nadal beat Leonardo Mayer in straight sets on Thursday to reach the semifinals of the Mexican Open, setting up a meeting with Spanish compatriot Nicolas Almagro.
After seven months away treating a left knee injury, Rafael Nadal left many questions unanswered in his comeback tournament.

Nadal lost both the singles and doubles finals in the space of a few hours Sunday at the VTR Open in Chile. And Horacio Zeballos, who earned the first title of his career by beating Nadal in three sets, repeated what Nadal has been saying. "Not playing has hurt him," Zeballos said.

As James Blake warmed up for a match Monday at the William H.G. FitzGerald Tennis Center stadium, all he had to do was look over his left shoulder to get a glimpse of the player he used to be.
American twins Bob and Mike Bryan reached the men's doubles quarterfinals at the French Open by beating Mark Knowles of the Bahamas and Xavier Malisse of Belgium 6-3, 6-2 on Sunday.
France has reached its first Davis Cup final in eight years after securing an insurmountable 3-0 lead over Argentina by winning the doubles.
No. 2 seed John Isner fought through another final-set tiebreaker with a 4-6, 7-6 (6), 7-6 (7) victory over Gilles Muller of Luxembourg in the second round of the Atlanta Tennis Championships on Wednesday night.

Mandy Fish now has won 80 percent of his first serves this year, giving him the second-best record on the Atlanta Tennis Championships tour.