It was RCB's third win — and second in a row — in 10 matches so far this season, keeping their slim hopes of reaching the playoffs alive
Keys will play defending Brisbane champion Karolina Pliskova in Sunday afternoon's final. Pliskova beat Australian Open champion Naomi Osaka 6-7 (10), 7-6 (3), 6-2 after saving a match point.
Keys said a chat with her coach Juan Todero helped to swing the momentum.
"He pretty much just said 'Don't be discouraged'," Keys said. "I felt like I had chances, but couldn't close on those ... and once I did, I felt the momentum went back and forth but I gained confidence."
Pliskova will attempt to win her third Brisbane title in four years.
Osaka broke for the first time for a 6-5 lead in the second set after winning the first-set tiebreaker. But the Japanese player was not able to convert the break.
"I was proud I stayed with her because it could go a really bad way after that first set," Pliskova said. "There was not many things I did wrong, it was more about her (playing well)."
Despite losing her opening singles match in Brisbane, top-ranked Ash Barty has managed valuable court time on the way to the women's doubles final.
She will partner Kiki Bertens against top-seeded Barbora Strycova and Su-Wei Hsieh on Sunday.
Results
Semifinals
Singles
Madison Keys (USA x8) bt Petra Kvitova (CZE x6) 3-6, 6-2, 6-3
Karolina Pliskova (CZE x2) bt Naomi Osaka (JPN x3) 6-7 (10/12), 7-6 (7/3), 6-2
Doubles
Hsieh Su-Wei (TPE)/Barbora Strycova (CZE x1) bt Lyudmyla Kichenok (UKR)/Yang Zhaoxuan (CHN) 7-6 (7/3), 6-3
It was RCB's third win — and second in a row — in 10 matches so far this season, keeping their slim hopes of reaching the playoffs alive
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