(CNN) -- Second seed Robin Soderling eased into the quarterfinal of the Valencia Open on Thursday with a straight sets victory over Spain's Daniel Gimeno-Traver.
The Swede, who is now favorite to win the tournament following the departures of top seed Andy Murray and third seed Fernando Verdasco, took just over an hour to progress 6-2 6-3.
Soderling is joined in the last eight by fourth-seeded Spaniard David Ferrer, who had no problems defeating Russian qualifier Teymuraz Gabashvili 6-4 6-1.
And Russian sixth seed Nikolay Davydenko booked his place in the quarters with an impressive 7-6 6-2 success over Argentine Juan Ignacio Chela.
Meanwhile, there was a surprise in the Swiss Indoor tournament in Basel as 2002 champion David Nalbandian -- who is unseeded this year -- recovered from dropping the opening set to see off sixth seed Marin Cilic.
Argentine Nalbandian reached the last eight with a 4-6 6-4 6-4 win, continuing his remarkable record in the event which has also seen him reach the final in 2003, 2004 and 2008.
The defeat all but ends any chance Croatian Cilic had of qualifying for one of the three remaining places in the eight-man field for the World Tour Finals in London later this month.
Nalbandian now takes on fourth seed Andy Roddick, who beat Kazakh Andrey Golubev 6-3 6-4, while second seed and holder Novak Djokovic beat Finn Jarkko Nieminen 6-4 7-6 and will play Dutchman Robin Haase.
Radek Stepanek secured his last eight place with a 3-6 6-2 6-0 victory over Colombian Santiago Giraldo and the Czech now faces top seed and local hero Roger Federer for a semifinal place.