Roger Federer ruled out for a month after knee surgery

World number three Roger Federer will be out of action for a month after having arthroscopic knee surgery.

The 34-year-old 17-times Grand Slam champion had the surgery in his native Switzerland to repair a torn meniscus.

He was injured the day after his four-set Australian Open semi-final defeat by Novak Djokovic last week.

Read more at: http://www.bbc.com/sport/tennis/35482027