David Ferrer froze at vital moments as he lost to Roger Federer at the ATP World Tour Finals at the O2 Arena.
That's the view of Sky Sports expert Greg Rusedski after the industrious Spaniard was downed 6-4 7-6 (7-5) by Federer on Thursday afternoon - Ferrer's 14th consecutive defeat to the 17-time Grand Slam champion.
The Alicante-born star failed to convert myriad break point opportunities in the first set and was punished by Federer, who has now booked his spot in the competition's semi-finals for a 10th time.
"When the big points arrive, Roger Federer lifts his game, David Ferrer, being down 13-0 to Federer in the head-to-head record, doesn't," said Rusedski, the former world number four and US Open finalist.
"He gets tight and nervous and that was the difference. Ferrer had lots of opportunities in the first set but he was only one for eight in break points, when usually he has a conversion rate of over 50 per cent."
Annabel Croft, meanwhile, believes Ferrer - who has won seven tournaments this year, including last week's ATP Masters 1000 event in Paris - showed all his usual diligence against the world number two.
But the Sky Sports pundit feels the 30-year was outgunned by Federer's superior strokeplay as the Swiss maestro recorded his 85th win on UK soil.
"Ferrer is 10 out of 10 for effort; he runs, chases and his speed around the court is extraordinary," said Croft. "But what was noticeable were the angles Federer was hitting.
"He has so much choice at his disposal and while Ferrer was applying the formula he uses against everybody else and was trying to be aggressive, he has to hope that Federer will miss."
Federer's triumph means he is still on course to defend the ATP World Tour Finals trophy, which he has claimed on six occasions and won last year by beating Jo-Wilfried Tsonga 6-3 6-7 6-3.