Zheng Saisai claimed her maiden WTA Tour title with an upset win over Aryna Sabalenka in the Silicon Valley Classic final on Sunday.

The 25-year-old from China recorded a 6-3 7-6 (7-3) victory over second seed Sabalenka in the decider of the WTA Premier event in San Jose, California.

Zheng, a runner-up in the women's doubles at the French Open this year, was ruthless on her way to a first WTA crown.

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She converted all five of her break points as Sabalenka managed to take just three of her seven opportunities.

Zheng had lost her only previous WTA final – in Nanchang last year – but is now set to rise back into the world's top 40.

Sabalenka, meanwhile, now holds a 3-4 win-loss record in WTA deciders, her run of three consecutive victories in finals coming to an end.