With momentum on her side, Garcia broke Pliskova's serve twice to claim her first WTA title since her back-to-back triumphs in Wuhan and Beijing last year.
"I was a little bit more aggressive than her, and I think that's what made the difference in the first set," the 24-year-old Garcia said.
"Of course, I've won three titles in China so it's bringing me luck... China is doing a lot for women's tennis."
The defeat means Pliskova will have to wait to book a place at the WTA Finals, but the Czech remains eighth in the Race to Singapore standings.
(Reporting by Hardik Vyas in Bengaluru; Editing by Toby Davis)
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