Fed undergoes knee surgery

Seventeen-time Grand Slam winner Roger Federer underwent "successful" surgery on his knee Wednesday and will be ruled out of action for one month, his agent said.

Federer underwent the surgery to repair a torn meniscus sustained the day after his semifinal match at the Australian Open, according to Tony Godsick.

As a result of the surgery, Federer will now miss the ATP tournaments in Rotterdam and Dubai this month.

"I am so disappointed to have to miss Rotterdam and Dubai as they are two of my favourite tournaments on the ATP World Tour," Federer said.

"While this is an unfortunate setback, I feel grateful that up until now I have remained mostly healthy throughout my career. My doctors have assured me that the surgery was a success and with proper rehabilitation, I will be able to return to the Tour soon."

Unlike great rival Rafael Nadal, Federer has enjoyed a relatively injury-free career, the exception being bouts of recurring back pain.

The last time that happened was at the 2014 ATP World Tour Finals in London when he withdrew at the last minute from the final against Djokovic.

Federer will now aim at being fit in time for the first two Masters Series tournaments of the year at Indian Wells and Miami in March.