Top seed Saina took just 33 minutes to beat Chinese Taipei's Tai 21-18 21-15 at the Singapore Indoor Stadium.
The world number six, had bagged her maiden Super Series title in June last year when she claimed the top honours at the Indonesian Open.
"I never expected to reach the finals as there were two good Chinese players in the draw but I believed in myself and got the result I wanted," the jubilant 20-year-old said.
The in-form Saina came here after winning the India Open Grand Prix Gold title only last week.
Join us in congratulating Saina on her wonderful achievement.