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Top-ranked Victoria Azarenka and second-seeded Maria Sharapova advanced to the second round of the Madrid Open with straight-set wins Sunday on the event's new blue-clay court.

Juan Martin del Potro fought off stomach problems and beat Ivo Karlovic on Friday, leaving Argentina tied with Croatia in the Davis Cup quarterfinals.

Robby Ginepri became the first American to win his way into the second round of the BNP Paribas Open by beating Paoli Lorenzi of Italy 1-6, 6-3, 6-4 on Thursday.

Jurgen Melzer eased past Alex Bogomolov Jr. of Russia 6-2, 6-4, 6-1 Sunday to help Austria reach the quarterfinals of the Davis Cup for the first time since 1995.

Ivo Karlovic and Ivan Dodig beat Tatsuma Ito and Yuichi Sugita 6-4, 6-4, 3-6, 6-3 Saturday to give Croatia a 2-1 lead over Japan in their first-round Davis Cup World Group series.

David Nalbandian rallied to beat Florian Mayer 2-6, 6-0, 6-1, 7-6 (5) and give Argentina a 2-0 lead over Germany on Friday in the first round of the Davis Cup in Bamberg, Germany .

Lukas Lacko of Slovakia beat seventh-seeded Robin Haase of the Netherlands 6-4, 6-4 Friday to reach the Zagreb Indoors semifinals.

Lukas Lacko of Slovakia ousted second-seeded Alex Bogomolov Jr. of Russia 6-0, 6-7 (1), 6-1 to advance to the Zagreb Indoors quarterfinals on Thursday.

Blown calls, racket rampage and the abysmal Americans. Let's just say it was an interesting first week in the land of Oz.

Say what you want about old-man Roger Federer. But don't ever question his desire to win.

Rafael Nadal stayed on track for his second Australian Open title when he beat Lukas Lacko 6-2, 6-4, 6-2 in a third-round match to start play Friday on Rod Laver Arena.

Fans flock to Ivo Karlovic on Twitter. Imagine his following if he foils Roger Federer's fun Down Under.

Bothered by a left shoulder injury late last year, Rafael Nadal had his right knee heavily taped during his 6-4, 6-1, 6-1 win over Alex Kuznetsov.

The 2011 season is over, which means it's time to reminisce on the good, bad and ugly -- and in the case of Fernando Verdasco, a little resentment.

Former top-ranked Thomas Muster's brief comeback from retirement ended Tuesday after a 6-2, 6-3 loss to fellow Austrian Dominic Thiem in the first round of the Erste Bank Open.

Top-seeded Novak Djokovic won the first 14 games in a 6-0, 6-0, 6-2 victory over Argentina's Carlos Berlocq in the second round of the U.S. Open.