The German third seed struggled with a shoulder injury in the
third set and went off court for treatment when trailing 3-0.
The break failed to revitalize her, however, and after saving
two match points, Kerber surrendered her title hopes with an
ill-judged dropshot that failed to clear the net.
World number 58 Bertens will next play either French wild card
Alize Lim or Italian Camila Giorgi.
(Reporting by Pritha Sarkar, editing by Ed Osmond)
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