Del Potro powers through to Estoril quarters

ESTORIL, Portugal: Juan Martin del Potro celebrated the start of his pre-French Open campaign with a 6-1, 6-0 hammering of Portugal's Rui Machado to reach the quarter-finals of the Estoril Open on Thursday.

Del Potro, the top seed and defending champion, was playing an ATP match on the surface for the first time this season after winning two clay Davis Cup rubbers at home in April when Argentina defeated Croatia.

A year ago, Del Potro arrived at the Estadio Nacionale ranked ranked 46th and unsure of his game after missing much of 2010 following wrist surgery.

However then, the 2009 US Open champion dug deep to claim his first title in the country with a final victory over Spaniard Fernando Verdasco.

Victory over Machado improved Del Potro's 2012 record to 24-6 ahead of his semi-final against two-time champion Albert Montanes on Friday.

Montanes, seeded seventh, advanced to last eight with a 4-6, 6-4, 6-3 win over American Bobby Reynolds.

In the women's event, Italian top seed Roberta Vinci reached the semi-finals by defeating Russian seventh seed Nadia Petrova 6-2, 1-6, 6-4.

Estonian Kaia Kanepi, the number six seed, upset Czech fourth seed Petra Cetkovska 6-3, 3-6, 6-3.

Unseeded Carla Suarez Navarro defeated Spanish compatriot Silvia Soler-Espinosa 6-3, 6-3. (AFP)