Roger Federer had knee surgery Wednesday to repair a torn meniscus and will miss tournaments in Rotterdam and Dubai this month.
It is a rare injury setback for Federer, 34, who had relatively minor back problems in 2008 and 2013.
A statement on his official website did not specify which knee is injured, though it said the injury occurred last Friday, one day after his Australian Open semifinal loss to Novak Djokovic.
“While this is an unfortunate setback, I am encouraged and grateful that my doctor said the procedure was a success,” Federer said on his Facebook page.