After an evenly-matched first set, Zhang ran through the second, winning 16 of the last 17 points against the 124th-ranked American.
Zhang, whose previous best singles performance was reaching the semi-finals in the same event in 2010, became the fifth Chinese player to win a WTA title after Li Na, Zheng Jie, Yan Zi and Sun Tiantian.
(Reporting by Sudipto Ganguly in Mumbai; editing by Amlan Chakraborty)
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