Cape Town - South Africa's Kevin Anderson could be sidelined for months with a recurring knee injury after undergoing another surgery.
Anderson has endured a frustrating time in his career after being sidelined for most of 2019 with the injury.
The 33-year-old, who has now fallen to a ranking spot of 121, crashed out of the opening round of the New York Open last week.
Anderson revealed on Friday that he underwent a successful procedure on his right knee.
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Anderson added his frustration over being on the sidelines again, but believes that he'll be back on the court soon.
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There's no specific mention on how long the South African will be out for, but he joins Roger Federer, who also underwent knee surgery and is expected to be out until June.