SINGAPORE — Agnieszka Radwanska of Poland advanced to the title match of the season-ending WTA Finals for the first time in seven appearances, beating second-seeded Garbine Muguruza 6-7 (5), 6-3, 7-5 Saturday.
Fifth-seeded Radwanska's previous best results were two semifinal finishes in 2012 and 2014.
Radwanska led her Spanish opponent in all three sets, going ahead 4-1 in the first, 4-0 in the second and 4-1 again in the decider.
Muguruza had won all four of their previous matches this year.
Radwanska will play the winner of the other semifinal later Saturday between third-seeded Maria Sharapova and fourth-seeded Petra Kvitova.