"I am disappointed that I will not be able to compete at the Wuhan Open or the China Open due to continuing issues with my right shoulder," the 34-year-old said in a statement.
"I have been practising and playing but my shoulder is still not fit for tournament play. I am focused on getting ready to compete at the WTA Finals in Singapore."
Williams has won two titles this year, in Rome and at Wimbledon, and finished runner-up in three tournaments.
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(Reporting by Shravanth Vijayakumar in Bengaluru, editing by Ed Osmond)
