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TOKYO -- Kei Nishikori says he will sit out Japan's Davis Cup quarterfinal against the Czech Republic this weekend due to a groin injury.
Nishikori beat Roger Federer in the Sony Open quarterfinals last week, but he had to withdraw from the semifinal against Novak Djokovic because of pain in his left groin.
Nishikori has retired or withdrawn 14 times in his career, including three times in Grand Slam events. He said he won't need surgery, but he's unsure how long he'll be sidelined.
Nishikori's absence hurts Japan's chances of beating the two-time defending champion Czechs in their first tie since 1935.
Go Soeda, scheduled to be Japan's No. 1 in Nishikori's absence, came down with a fever and also will not play Friday.
In addition, the Czech team will be missing its top player after Tomas Berdych withdrew following two tough tournaments in the United States.
Radek Stepanek will face Tatsuma Ito in the opening singles match Friday. Taro Daniel will play for Japan in the second singles match against Lukas Rosol.
The Associated Press contributed to this report.