Kei Nishikori has become the latest leading player to announce he will miss the rest of the season because of injury.
The world No 9 withdrew from this week's Masters event in Cincinnati with a right wrist problem and scans have revealed a tear in one of the tendons.
Nishikori is hoping to avoid surgery but joins fellow top-10 players Novak Djokovic and Stan Wawrinka in sitting out the rest of 2017.
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It has been a difficult season for Nishikori, who has struggled with wrist issues for several months and has slipped in the rankings from a high of four in March.A statement from Nishikori's manager read: "Two days ago during practice in Cincinnati, Kei hit a serve and heard a 'pop' in his wrist.
"We went straight to the hospital to take an MRI. Yesterday, we went to see a very renowned wrist specialist who works with many of the MLB baseball pitchers.
"We saw another specialist today to get a second opinion. On top of that we have sent MRI results to three other wrist specialists to ensure we get several independent opinions from specialists.
"After consulting with all of them, it has become clear that Kei has a tear in one of the tendons in the right wrist.