Radwanska was the first of the two to advance, rallying from 3-1 down to take the first set and from another break down to take the third set, eventually getting past Magdalena Rybarikova, 6-3, 4-6, 6-3.
"I'm so happy," Radwanska said after the match. "I had ups and downs during the match, but I always felt the crowd were behind me, screaming my name. It was a great feeling. I'm feeling good over here.
"On the court I'm always fighting until the end, trying to stay aggressive and trying to keep focused, even when I'm losing. I'm happy I was able to stay in the game and play my best tennis in the end."
And just like match point during her quarterfinal win over Tsvetana Pironkova on Friday, Radwanska was helped a few times by a lucky net cord against Rybarikova - how does she feel about that luck?
"I think the net likes me here!" Radwanska said.
"It's true - I've had luck, today and yesterday. It helps to be a little lucky sometimes."
Radwanska is now through to the second WTA final of her career. Her first came more than three years ago on the grass courts of 's-Hertogenbosch in 2012, where she was a runner-up to Nadia Petrova.
How will the former No.29 - now No.99 - prepare for what could be the biggest day of her career?
"I need to rest tonight. I'll be getting a massage for sure," she said.
"From 3-2 in the second set we had so many long rallies, and I'm feeling tired, so I have to recover."
Awaiting Radwanska in the final will be another player in the hunt for their first WTA title in the No.71-ranked Tsurenko, who dispatched former Top 15 player Kirsten Flipkens in straights, 6-4, 6-2.
Tsurenko is playing the first WTA final of her career. Her previous-best results were two semifinals, at Brisbane in 2013 (falling to Anastasia Pavlyuchenkova) and Tashkent in 2014 (losing to Karin Knapp).
Radwanska beat Tsurenko in the pair's only previous meeting, though it might mean little - it was in Doha qualies more than three years ago, and Tsurenko had to retire from the match after a set.
? Istanbul Cup (@istanbul_cup) July 25, 2015