Nicolas Almagro's chances of making next month's World Tour Finals in London were dealt a blow when he was beaten 6-3,7-5 by top seed and Spanish compatriot David Ferrer in the quarter-finals of the Valencia Open on Friday.
Almagro, seeded sixth at the indoor hardcourt event, did not win a game on the Ferrer serve but lost his own twice as he slipped to a 12th defeat in 12 career meetings with the world number five.
"I managed to get a lot of my first serves in and kept that up for the whole match," said Ferrer who has already qualified for the Tour Finals.
"It was a very balanced affair and I felt I was very consistent and maybe at the end of the second set his level tailed off a bit and I was able to take advantage," the 30-year-old added in an interview with Spanish television.
Ferrer, like World No 12 Almagro a double champion in Valencia, will play Ivan Dodig on Saturday for a place in the final after the Croatian qualifier upset compatriot and seventh seed Marin Cilic 6-2, 7-6.
Cilic needed a win against 110th-ranked Dodig to boost his slim hopes of making it through to the Tour finals but came up short in the pair's first meeting on the ATP Tour.
Alexandr Dolgopolov of Ukraine won the first eight games of his quarter-final against Marcel Granollers before completing a crushing 6-0, 6-2 victory over the defending champion to set up a semi-final against Juergen Melzer.
Austrian Melzer, making his debut in Valencia and chasing a fourth career title, saw off promising Belgian David Goffin, ten years his junior, 7-6, 6-4.
Former World No 1 Rafael Nadal announced on Thursday he had pulled out of the Tour Finals as he continues his recovery from a knee injury that has sidelined him since Wimbledon in June and dropped him down to fourth in the rankings.
Nadal's withdrawal secured Juan Martin del Potro's place in London and there are two berths still up for grabs.
Players including Jo-Wilfried Tsonga and Janko Tipsarevic, who pulled out of their first-round matches in Valencia with injuries, and Richard Gasquet and Almagro are also in contention.
As well as Del Potro and Ferrer, Novak Djokovic, Roger Federer, Andy Murray and Tomas Berdych are already through to the Tour Finals.
Next week's Paris Masters will be the final chance for the remaining hopefuls to seal their spot at the November 5-12 event in London.