Rafael Nadal forced to withdraw from London Olympics
July 20, 2012 -- Updated 1847 GMT (0247 HKT)
Rafael Nadal has been forced to withdraw from the Olympics due to knee problems
- Reigning champion Nadal forced out of London Games by ongoing knee problem
- Tennis star was due to carry Spain's flag at opening ceremony
- Wimbledon organizer's new tournament dates from 2015
(CNN) -- Reigning Olympic champion Rafael Nadal has been forced to withdraw from the London 2012 Olympics due to ongoing knee problems.
Nadal, gold medallist four years ago in Beijing admitted he was "not in the right physical condition to compete" and that he had to "think about Spanish sport."
The world number two, who was due to carry Spain's flag at the opening ceremony, had already taken two weeks off in the buildup to the Olympics to recover from tendinitis in his knee
"I've waited until the final moment of my preparation and my training, but I cannot do it," Nadal said in a statement released to the Spanish press on Thursday.
Steffi Graf and Andre Agassi on Olympics
Roger Federer of Switzerland celebrates after defeating Andy Murray of Great Britain to win his 7th Wimbledon championship in London on Sunday, July 8. Visit CNN.com/tennis for complete coverage.
Men's singles Wimbledon Championship
"Today is one of the saddest days in my career. Carrying the flag for Spain at the opening ceremony was set to be one of the biggest honors, one of the most special moments for me.
"For this reason I hope you can understand how difficult it has been for me to take this decision. One of my teammates who is better prepared than me can take my place and compete to the best of his ability."
The Spanish Tennis Federation announced that world number 30 Feliciano Lopez would take Nadal's spot in the singles competition. Marc Lopez, who has won doubles titles with Nadal on the ATP tour, will take his place in the doubles competition.
The Spanish Olympic Federation have chosen basketball star Pau Gasol as the new flag bearer.
Former world number one Nadal recorded his 11th grand slam win at June's French Open, but crashed out of Wimbledon in the second round to unfancied Czech player Lukas Rosol.
Nadal had only two weeks to make the transition from the clay courts of Roland Garros to Wimbledon's grass courts, but in future he will have longer to adapt.
Wimbledon organizers announced on Thursday that from 2015 there will be an extra week between the two slams.
Carrying the flag for Spain at the opening ceremony was set to be one of the biggest honors.
"The best interests of tennis will be served by allowing the players more time to recuperate and to adjust from the clay of Roland Garros to the grass at Wimbledon," said All England Club chairman Philip Brook.
"We think most players welcome the prospect of a longer grass court season and spending more time on the softer surface of grass.
"In making this change from 2015 we recognize that there will be some important consequences for the overall tennis calendar, and enough time needs to be given to allow us all to plan accordingly."
Part of complete coverage on
June 30, 2014 -- Updated 1135 GMT (1935 HKT)
When Agnieszka Radwanska refused to look her opponent in the eye after losing at Wimbledon, it raised more than eyebrows.
June 23, 2014 -- Updated 0114 GMT (0914 HKT)
It's 10 years since a teenage Maria Sharapova became the darling of Wimbledon's hallowed Center Court, launching herself as a star.
Rafael Nadal is still the "King of Clay" -- but his crown has slipped a bit, says CNN's Will Edmonds.
May 23, 2014 -- Updated 0746 GMT (1546 HKT)
He's regularly voted France's favorite famous person, but many of the nation's youth have "no idea" about his glorious sporting past
May 5, 2014 -- Updated 2359 GMT (0759 HKT)
The Ukrainian-born, British tennis star loses fight against liver cancer, just a few weeks after revealing that she was battling the disease.
April 29, 2014 -- Updated 1555 GMT (2355 HKT)
Five-time grand slam champion Martina Hingis has followed her mom into a coaching role, setting up a new tennis academy in Barcelona, Spain.
April 16, 2014 -- Updated 1238 GMT (2038 HKT)
It's no easy matter becoming a world class tennis player. It's even harder when everyone (really -- everyone) is calling you the "new Martina Hingis."
April 2, 2014 -- Updated 1420 GMT (2220 HKT)
At the 2009 Australian Open, French men's tennis was the talk of the town.
April 15, 2014 -- Updated 1800 GMT (0200 HKT)
Rafael Nadal may be most at home on a clay tennis court, but he has always found comfort on the sea.
March 21, 2014 -- Updated 1107 GMT (1907 HKT)
Tennis star Venus Williams reveals how she is beating the autoimmune disease that derailed her career.
March 5, 2014 -- Updated 1014 GMT (1814 HKT)
After two decades dedicated to the game, Amelie Mauresmo wants a second life -- one away from tennis.
Almost five years to the day after reducing Roger Federer to tears at the Australian Open, Rafael Nadal shed a few in his own loser's speech.
Today's five most popular stories