Rafael Nadal vows to play on despite latest injury setback at US Open

US Open title hopes wrecked by knee problems as he retires from semi-final, trailing by two sets, to Juan Martin del Potro

epaselect epa07004443 Rafael Nadal of Spain talks with a trainer seconds before retiring as he plays Juan Martin del Potro of Argentina during their semi-final match on the twelfth day of the US Open Tennis Championships the USTA National Tennis Center in Flushing Meadows, New York, USA, 07 September 2018. The US Open runs from 27 August through 09 September.  EPA/JASON SZENES *** Local Caption *** 53000073
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Rafael Nadal has vowed the knee injury that forced him out of the US Open semi-finals on Friday will not stop him chasing more grand slam success in the future.

The Spaniard, his world No 1 ranking still safe despite the fact he will not now successfully defend his US Open title, said the trouble was the familiar tendinitis he has dealt with for a decade - unpredictable but not career-threatening.

"I know what I have," he said after limping off Arthur Ashe Stadium having lost two sets to third-seeded Argentine Juan Martin del Potro. "I know what is going on with the knee. I know how I have to work to be better as soon as possible."


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But it was clearly galling for the player famed for his fighting spirit to hobble out of a second major this year, having retired in the fifth set of his Australian Open quarter-final against Marin Cilic with a torn inner hip muscle.

"It's not about losing, it's about not having the chance to fight for it," he said.

"I'm having two great years," added Nadal, who was trying to complete a French Open-US Open double for the second straight season. "Last year was a fantastic year. This year has been a fantastic year until this moment. I lost four matches. Two of them I had to retire."

The frustration isn't new for Nadal.

"I feel that I fought all my career against these kind of things too," added the 32-year-old, who has missed at least eight grand slams due to injury since his major debut at Wimbledon in 2003.

That hasn't stopped him amassing 17 major titles, three short of Roger Federer's record 20.

"It's tough, these moments, but on the other hand I'm going to keep going and I'm going to keep working hard to keep having opportunities."

Nadal's injuries have run the gamut, from the start of his elite career.

An elbow injury in 2003 prevented his expected French Open debut that year and a stress fracture in one ankle kept him out of Roland Garros and Wimbledon in 2004.

He's nursed foot, back and wrist injuries, adductor and abdominal trouble. And through it all the tendninits in his knees has periodically slowed him.

"All my career everybody said that because of my style, I will have a short career," he noted. "I'm still here.

"I'm still here because I love what I am doing. I still have the passion for the game.

"I'm going to keep fighting and working hard to keep enjoying this tour and keep having chances to compete at the highest level. So that's all."