Klizan is 6-0 in finals, including a win in St. Petersburg six years ago, and the Slovak is coming off a victory at the Austrian Open last month.
Klizan ended Stan Wawrinka's latest bid on Saturday for a first title since his return from a knee injury. Klizan bounced back from losing the first set of their semifinal to beat Wawrinka 4-6, 6-3, 7-5.
Thiem defeated Roberto Bautista Agut, the big-hitting Austrian firing in 15 aces on his way to reaching his fifth final of the season.
Thiem is 10-7 in career finals and 2-2 this season, most recently losing the Roland Garros final to Rafael Nadal.
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