SINGAPORE - World No. 6 Agnieszka Radwanska booked her first final at the prestigious season finale of the WTA Tour after beating Garbine Muguruza 6-7 (5-7), 6-3, 7-5 on Saturday afternoon at the Singapore Indoor Stadium.
Up against a fast-tiring opponent, Radwanska - nicknamed "Ninja" for her crafty and clever style of play - pulled off some stunning shots to steer her way into Sunday's final.
The win is her third over the world No. 3 Muguruza in seven meetings, and just the Pole's first in their last five encounters.
Said an emotional Radwanska after her win: "After two losses in the (round-robin stage), I thought it was all over. I didn't think I'd come back.
"So many rallies, I'm so glad I could win that match."
Radwanska is in the final despite a lacklustre showing in the round-robin stage where she won just one out of three matches - a 7-6 (7-5), 6-1 win over Romania's Simona Halep.
She will play Petra Kvitova in the final, after the Czech upset Maria Sharapova 6-3, 7-6 (7-3) in the other semi-final.
Said Kvitova, the 2011 WTA Finals champion: "I didn't expect it for sure. Maria played so well in the group. I knew it's a tough match and I knew I had the game to beat her, so I was really trying today."