BASTAD, Sweden — Caroline Wozniacki was taken to three sets by unseeded Elise Mertens before winning 7-5, 4-6, 6-2 Saturday to advance to her second Swedish Open final.
The top-seeded Dane fired six aces on clay while her Belgian opponent had nine double faults.
Wozniacki lost the 2009 final to Maria Jose Martinez Sanchez.
Seventh-seeded Katerina Siniakova of the Czech Republic saved 88 percent of her breakpoints to beat Caroline Garcia 6-2, 7-5 in the other semifinal.
Siniakova lost in last year’s final to Germany’s Laura Siegemund.
Third-seeded Garcia was aiming to become the first French woman in the final in five years.