Roger Federer's knee surgery caught the tennis world by surprise. While the 17-time Grand Slam champion expects to miss only a month away from the ATP World Tour, his pending absence alerts us to how close tennis is to a star-power crisis.
Federer underwent arthroscopic knee surgery in Switzerland early this week. He suffered a torn meniscus after his loss to Novak Djokovic in the 2016 Australian Open semifinals.
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