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So how about them fightin' words from Ivan Ljubicic, who said the Americans are running scared from the European clay? Let's just say the U.S. contingent didn't take it too kindly.

Ivan Ljubicic wasn't a Grand Slam champion or a consistent titlist. But he had one heck of a journey during which he evolved into one of the game's foremost activists.

Ivan Ljubicic of Croatia has announced he will retire from tennis after the Monte Carlo Masters in April.

Jo-Wilfried Tsonga of France and Janko Tipsarevic of Serbia won in straight sets Wednesday to advance to the quarterfinals of the Open 13.

Nikolay Davydenko had nine aces and didn't face a break point in a 6-1, 7-5 victory Tuesday over Andreas Beck of Germany to reach the second round of the Open 13.

Ivan Ljubicic hit 27 aces but still needed three sets to beat Florent Serra of France 6-4, 6-7 (3), 6-3 Monday and reach the second round of the Open 13.

Paul-Henri Mathieu rallied from a set down Monday to upset fourth-seeded Feliciano Lopez 4-6, 7-6 (5), 6-4 in the opening round of the ABN Amro World Tennis Tournament.

Michael Berrer of Germany upset top-seeded Ivan Ljubicic 6-4, 6-4 on Wednesday to advance to the quarterfinals of Zagreb Indoors.

Second-seeded Alex Bogomolov Jr. of Russia beat wild card Dino Marcan of Croatia 6-3, 6-1 to advance to the second round of the Zagreb Indoors on Tuesday.

Top-seeded Ivan Ljubicic of Croatia beat Slovakia's Karol Beck 7-6 (5), 3-6, 6-3 on Monday to advance to the second round of the Zagreb Indoors tournament.

Novak Djokovic cruised to a 6-1, 6-2 victory over Lukasz Kubot of Poland in the second round at the Swiss Indoors on Thursday.

Tomas Berdych upset top-seeded Jo-Wilfried Tsonga 6-4, 4-6, 6-1 Saturday to set up a China Open final against Marin Cilic.

Top-ranked Caroline Wozniacki was knocked out of the China Open quarterfinals by Flavia Pennetta of Italy 3-6, 6-0, 7-6 (2) on Friday.

Top-seeded players Jo-Wilfried Tsonga and Caroline Wozniacki advanced to the quarterfinals at the China Open on Thursday.

Second-seeded Victoria Azarenka moved into the third round of the China Open with a victory over Polona Hercog, while in the men's draw third-seeded Tomas Berdych advanced with a win over Philipp Kohlschreiber.

Top-seeded Jo-Wilfried Tsonga and top-ranked Caroline Wozniacki advanced Tuesday at the China Open.