The fifth seed won 6-2, 6-4 in 73 minutes to begin her season and her Australian Open preparations with a bang.
The 25-year-old Alexandrova, ranked a career-high 34th in the world, collapsed to her knees after dismissing Rybakina, the seventh seed from Kazakhstan.
Alexandrova, who triumphed in a WTA 125K event in Limoges, France last month, defeated former world number one Garbine Muguruza in the semi-finals in southern China.
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