In an interview with Diario de Mallorca, Rafael Nadal says he first hurt his knee this season at Indian Wells in March, then it got worse when he was forced to retire against Andy Murray in Miami. He then competed with discomfort all the way until he stopped playing after Wimbledon.

Nadal said he took a risk in the semifinals of Roland Garros, where he posted a quick win despite playing with inflammation in his knee, but that he was solely focused on winning his seventh title there. He also said he was not surprised Lukas Rosol upset him in the second round of Wimbledon, because for the two weeks prior he was only able to train one hour a day, without running. “It was very bad, and I was playing with the knee asleep,” he said. “You always think you can do it, but it was not possible even though I did my best.”  
Nadal added that his defeat to Rosol could not be compared to when Robin Soderling upset him at the 2009 French Open.

“There is no point of comparison,” he said. “Both have in common that my knee was bad, but I could compete at Roland Garros. In Wimbledon, no. The defeat to Rosol as was a death foretold for me.”

The 11-time Grand Slam champion added that being forced to pull out of the Olympic Games in London was worst feeling he has ever had when pulling out of an event. Nadal also pulled out of Wimbledon in 2009, where he would have been defending his title.  
The 26-year-old has said that he is planning to play the 2016 Olympics in Rio, but has not thought beyond that.