Having won the tournament in 2012 and 2014, the 26-year-old
Nishikori was chasing his third Japan Open title, which would
have put him one behind Stefan Edberg's record four wins in
Tokyo.
"It was hugely disappointing to have to retire from my match,"
the world number five said.
"It is possible that the injury was due to an accumulation of
fatigue and stress, but I came into this tournament with a lot
of rest and feeling very ready. I will get examined and hope to
recover in time for my next tournament."
Nishikori is next due to play in the Shanghai Masters starting
on Oct. 9.
(Reporting by Shravanth Vijayakumar in Bengaluru, editing by Ed
Osmond)
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