Former US Open champion Juan del Potro cruised into the quarterfinals of the Estoril Open with a 6-1, 6-0 win over Rui Machado of Portugal Thursday. The top-seeded Argentine looked to be only troubled in the third game of the first set when he saved two break points. He will meet 2009 and 2010 champion Albert Montanes of Spain, who came from behind to overcome Bobby Reynolds of the US 4-6, 6-4, 6-3. Joao Sousa of Portugal also went through after fifth-seeded Denis Istomin of Uzbekistan withdrew when trailing 3-6, 6-3, 4-2. Fourth-seeded Albert Ramos of Spain topped Germany's Bjorn Phau 7-5, 6-0. In the women's event, top-seeded Roberta Vinci of Italy reached the semifinals by beating Nadia Petrova of Russia 6-2, 1-6, 6-4. The Italian rallied from 3-0 down in the final set against the former third-ranked player. Vinci will take on Kaia Kanepi of Estonia, who defeated Petra Cetkovska of the Czech Republic 6-3, 3-6, 6-3. Carla Suarez Navarro beat Silvia Soler-Espinosa 6-3, 6-3 in an all-Spanish match, and Italy's Karin Knapp defeated Galina Voskoboeva of Kazakhstan 7-6 (4), 2-6, 6-4. Errani in last 4 In Hungary, top-seeded Sara Errani of Italy beat Alberta Brianti 6-4, 6-0 in an all-Italian quarterfinal at the Budapest Grand Prix Thursday. Errani will play Anna Tatishvili of Georgia, who defeated Aleksandra Wozniak of Canada 5-7, 7-6 (4), 6-4. Fifth-seeded Marina Erakovic downed Barbora Zahlavova Strycova of the Czech Republic 6-2, 1-6, 6-4. The New Zealander will play Elena Vesnina of Russia, who beat sixth-seeded Petra Martic of Croatia 6-3, 6-2. Two Aussies advance In Germany, Australian countrymen Bernard Tomic and Marinko Matosevic took similar paths to the quarterfinals of the BMW Open Thursday. Both dominated the opening sets, lost the middle tiebreakers and recovered in the third. The fifth-seeded Tomic beat Potito Starace of Italy 6-1, 6-7 (4), 6-3 to make his first career quarterfinal on clay. Tomic was down a break of serve at the start of the final set before coming back. Matosevic defeated fellow qualifier Robert Farah of Colombia 6-1, 6-7 (2), 6-2. Matosevic is playing his first career tournament on clay. Andujar, Paire advance In Serbia, top-seeded Pablo Andujar of Spain rallied past Filippo Volandri of Italy 4-6, 7-5, 6-2 to reach the quarterfinals of the Serbia Open Thursday. Benoit Paire of France also came from behind to advance, beating Guillermo Garcia-Lopez of Spain 4-6, 7-5, 7-5.
