By A Mystery Man Writer
Roger Federer will undergo additional surgery on his right knee, leaving him unable to compete at the 2021 U.S. Open.
Roger Federer out for remainder of tennis season after injury setback
Federer to have knee surgery, out of action for 'many months' - CGTN
Roger Federer to miss 2016 Rio Olympics due to knee injury
Roger Federer needs another knee surgery and will miss US Open
Roger Federer to miss Rio Olympic Games and rest of tennis season
Roger Federer needs another knee surgery and will miss US Open, Sports
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Federer had knee surgery and will miss the French Open : r/tennis
Federer needs another knee surgery and will miss US Open
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