Roger Federer announces his retirement from competitive tennis

20-time Grand Slam champion will play Laver Cup as final tennis event

Roger Federer is retiring from professional tennis at age 41 after a series of knee operations,

Roger Federer is retiring from professional tennis at age 41 after a series of knee operations,

His final ATP event will come next week, at the Laver Cup in London.

Federer has won 20 Grand Slam singles titles, including eight at Wimbledon.

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