VALENCIA, Spain (Reuters) - Gael Monfils suffered a setback in his bid to qualify for this month's World Tour finals when the third seed was upset 7-6 3-6 6-4 by unseeded Spaniard Marcel Granollers in the quarter-finals of the Valencia Open on Friday.
The Frenchman must now win next week's Paris Masters, where he has twice finished runner-up, to have a chance of securing one of three remaining places in the eight-man, season-ending competition at London's O2 Arena.
Argentina's Juan Martin Del Potro, the sixth seed, boosted his London hopes by beating unseeded American Sam Querrey 6-2 7-5.
The 2009 U.S. Open champion, who will play Granollers for a place in Sunday's Valencia final, looks to be getting back to something near his best after more than eight months out last year with a wrist injury.
Top seed and defending champion David Ferrer reached the last four when he overcame former world number three Nikolay Davydenko 6-3 6-4.
Spaniard Ferrer, the world number five, has already qualified for the November 20-27 Tour finals along with Novak Djokovic, Rafa Nadal, Andy Murray and Roger Federer.
Ferrer next faces Argentine wildcard Juan Monaco who ousted Spain's Juan Carlos Ferrero 6-3 6-3.
(Writing by Iain Rogers in Madrid, editing by Tony Jimenez)
Fox News First
Get all the stories you need-to-know from the most powerful name in news delivered first thing every morning to your inbox.
By entering your email and clicking the Subscribe button, you agree to the Fox News Privacy Policy and Terms of Use, and agree to receive content and promotional communications from Fox News. You understand that you can opt-out at any time.