Brian Baker has undergone yet another surgery, this time on the right knee he injured at the Australian Open two years ago.

The American tweeted a photo of his leg, saying he had the procedure done in Colorado:

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The 29-year-old was a top junior whose career was derailed by five surgeries before a comeback took him to the verge of the Top 50 in 2012. Unable to compete consistently following his knee injury at the 2013 Australian Open, he has not played since the 2013 U.S. Open.