Juan del Potro cruises into quarters
OEIRAS, Portugal -- Former U.S. Open champion Juan Martin del Potro cruised into the quarterfinals of the Estoril Open with a 6-1, 6-0 win over Rui Machado of Portugal on Thursday.
The top-seeded Argentine, who won at Flushing Meadow in 2009, looked to be only troubled in the third game of the first set when he saved two break points.
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Del Potro will meet 2009 and 2010 champion Albert Montanes of Spain, who rallied past Bobby Reynolds of the United States 4-6, 6-4, 6-3.
Joao Sousa of Portugal advanced after fifth-seeded Denis Istomin of Uzbekistan withdrew when trailing 3-6, 6-3, 4-2.
Fourth-seeded Albert Ramos topped 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.
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 defeated Silvia Soler-Espinosa 6-3, 6-3 in an all-Spanish match, and Karin Knapp defeated Galina Voskoboeva 7-6 (4), 2-6, 6-4.
Copyright 2012 by The Associated Press
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