Roger Federer will miss his fourth French Open in the last five years after having knee surgery .
The 20-time Grand Slam champion had surgery on his right knee - which had been "bothering him for a little while".
Federer, who won his only Roland Garros title in 2009, said doctors were "very confident of a full recovery".
In addition to the French Open, which takes place from May to June Federer will also miss the tournaments in Dubai, Indian Wells, Bogota and Miami.
[Source: BBC]
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