Sharapova says: "Toward the end of the Monday night's match, I felt pain in my left forearm". After yesterday's scan, the doctor has recommended I don't risk further injury.
Sharapova, who has also accepted a wild card into the WTA tournament in Cincinnati - another key warmup for the US Open - booked a second-round meeting with seventh-seeded Ukrainian Lesia Tsurenko, a 6-3, 6-3 victor over Spain's Lara Arruabarrena.
Her decision comes a day after the arm injury forced the 30-year-old to withdraw from the Stanford Bank of the West Classic.
In the opening round at Stanford, the former world No. 1 from Russian got past Jennifer Brady in three sets.
Shutdown, restrictions hit Indian-controlled Kashmir following death of civilian
The state government has closed all the colleges and schools in wake of the students protests. A fierce gunfight followed, police sources said.
Sharapova was injured during Italian Open second round in May, weeks after she returned to action from a 15-month doping ban, reports Efe.
"This is definitely tough for Maria", said Bank of the West Classic Tournament Director Vickie Gunnarsson. I am disappointed that an injury to me, take again the gap of the tennis courts, but I'm going to work with force to resume the practice of the sport that I love as quickly as possible. She will now be hoping that her body recovers in time for Flushing Meadows, where she has qualified for the qualifying draw; she could, however, receive a wildcard into the main draw there. However this latest injury not only puts participation in those tournaments in jeopardy, it also hinders her ability to build her ranking up so that she is not at the mercy of tournaments supplying her with them.
Sharapova, who is now ranked No. 171 in the world, received a wild-card entry into the Stanford tournament.