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Kei Nishikori Replaces Del Potro at ATP Finals
World No.4 Del Potro is still sidelined with a right knee injury sustained in Shanghai last month.
“It’s frustrating for me not to be able to compete in London,” Del Potro, who last played in the event in 2013 since when he has been plagued by injuries, said in an ATP statement on Saturday.
“It’s a very special tournament and I’ve tried everything possible to get my knee better. The rehabilitation is making good progress but I need more time.
“Of course, it’s disappointing for me right now but I had a very good season overall.”
Nishikori will make his fourth appearance at London’s O2 Arena where he reached the semi-finals in 2014 and 2016.