Rafa, Roger progress

Rafael Nadal advanced to the third round of the Australian Open on Wednesday without much trouble from his opponent or his injured right knee. Rival Roger Federer got through without picking up a racket.
Nadal beat German veteran Tommy Haas 6-4, 6-3, 6-4 in a 2 1/2-hour match, declaring that the twisted tendon in the heavily taped knee was not a concern.
Just before Federer was due on Hisense Arena, the Swiss player found out that his scheduled opponent, Germany's Andreas Beck, had a back injury and had to withdraw.
Nadal, asked after his match if he would have appreciated the same kind of good fortune, was pragmatic.
Nadal and Federer could meet in the semifinals next week. Top-seeded Novak Djokovic and fourth-seeded Andy Murray, the threats from the other side of the draw, play their second-rounders Thursday.
Two of the women's title contenders, defending champion Kim Clijsters and No. 1 Caroline Wozniacki, both won their second-round matches Wednesday on their way to a potential quarterfinal meeting.
French Open champion Li Na also advanced, defeating Olivia Rogowska of Australia 6-2, 6-2. She could meet Clijsters in the fourth round in a rematch of last year's final at Melbourne Park.
Clijsters needed only 47 minutes to beat Stephanie Foretz Gacon of France 6-0, 6-1 and Wozniacki defeated Anna Tatishvili of Georgia 6-1, 7-6 (4).
Clijsters said she doesn't give a lot of thought to who she'll face down the road of any tournament.
Third-seeded Victoria Azarenka, one of five players who could have the No. 1 women's ranking by the end of the tournament, beat Australian Casey Dellacqua 6-1, 6-0.
Elsewhere on the women's side, 10th-seeded Francesca Schiavone was eliminated 6-4, 6-3 by fellow Italian Romina Oprandi and No. 16 Peng Shuai of China lost 6-2, 6-4 to Iveta Benesova of Czech Republic.
Former No. 1-ranked Jelena Jankovic beat Chang Kai-chen of Taiwan 6-4, 6-2
Eighth-ranked Mardy Fish became the first top 10 player on the men's side to lose, falling 7-6 (4), 6-3, 7-6 (6) to Colombia's Alejandro Falla.
No. 7 Tomas Berdych beat Olivier Rochus of Belgium 6-1, 6-0, 7-6 (4) and 2009 US Open champion Juan Martin del Potro, No. 18 Feliciano Lopez and No. 30 Kevin Anderson also advanced.
Qualifier Lukas Lacko of Slovakia beat American Donald Young 6-3, 6-1, 3-6, 6-3 to earn a match against Nadal.
Another American, 16th-seeded John Isner, won a 4-hour, 41-minute marathon, including a 99-minute last set, over former Wimbledon finalist David Nalbandian. Isner had 43 aces in his 4-6, 6-3, 2-6, 7-6 (5), 10-8 win.
Nalbandian had several run-ins with the chair umpire during the often tense match. The Argentinian was enraged when a tournament official refused to overrule the chair umpire's decision to decline a review of a line call late in the fifth. He later smashed his racket to the ground in disgust when he netted a backhand on match point.
Ivo Karlovic of Croatia beat Carlos Berlocq of 7-6 (4), 3-6, 6-3, 6-4 and will play Federer in the third round, while 13th-seeded Alexandr Dolgopolov of Ukraine defeated Tobias Kamke of Germany 4-6, 6-1, 6-1, 3-6, 8-6.
Australian teenager Bernard Tomic beat another American Sam Querrey in the first night match on Rod Laver Arena, 3-6, 6-3, 7-6 (3), 6-3. Tomic will play Dolgopolov in the third round.