London: Novak Djokovic has pulled out of the Queen's Club tournament next week because of a knee injury.
The 24-year-old Serb announced his withdrawal within minutes of his four-set defeat by Roger Federer in the French Open semifinals on Friday, which ended a 43-match winning streak.
The No. 2-ranked Djokovic has tendinitis in his knee. Richard Gasquet has already pulled out with a leg injury and Mardy Fish with an abdominal injury.
The tournament begins the buildup to Wimbledon.
Rafael Nadal, Andy Murray, Andy Roddick and Juan Martin del Potro are due to play.