Azarenka gained Sunday's final with a 6-1, 6-3 rout of Poland's Agnieszka Radwanska.
The Belarus native will shoot for her fifth title of 2012 after topping the Pole, who won of this month's Miami WTA event.
Azarenka advanced to meet Sharapova, who got by reigning Wimbeldon champion Petra Kvitova of the Czech Republic, 6-4, 7-6 (7-3) in Stuttgart.
The Russian snapped Kvitova's streak of 27 consecutive indoor-court wins and will seek her first title of the year Sunday.
Sharapova fell to Azarenka in this year's Australian Open final as well as in the title match of March's Indian Wells event.
UPI Sports Results for September 20, 2014
UPI Sports Results for September 19, 2014