TORONTO, Canada (AFP) — Simona Halep will bid for a third Canadian title at the WTA Toronto Masters against determined Brazilian outsider Beatriz Haddad Maia.

Haddad Maia stunned 2021 finalist Karolina Pliskova 6-4, 7-6 (9/7) in the semifinals while Halep put years of big-match experience to good use in a 2-6, 6-3, 6-4 victory over seventh-seeded American Jessica Pegula.

Halep, the former world No. 1 from Romania who won 2016 and 2018 trophies in Canada, showed her definitive return to form with the victory after dropping from the top 10 in the rankings a year ago due to injury.

"We never played against each other so I didn't really know what to expect," Halep said.

"But it was a great fight. I'm really happy that I went through.

"Of course, I can improve," Halep added.

"But I'm building the confidence, I'm building the game, and I'm really happy that I'm in this position."

Haddad Maia, who stunned world No. 1 Iga Swiatek in the third round, blunted the noted serving attack of Czech Pliskova, who fired nine aces in defeat.

The first Brazilian to get to the final of a WTA Masters event has now won 17 matches since June, when she won grass court titles in Birmingham and Nottingham.

The South American, ranked 24th in the world, is guaranteed to breach the Top 20 next week.

Her match was a rollercoaster, with Haddad Maia fighting off Pliskova while leading 5-1 in the opening set.

Pliskova then seized a 4-1 lead in the second only for Haddad Maia to claw her way back.

Halep, who will return to the top-10 thanks to her victory, needed two and a quarter-hour to knock out American Pegula, who was the highest seed left in the field.

The 30-year-old winner of Roland Garros and Wimbledon titles could return to sixth in the world if she beats Haddad Maia on Sunday.

She will again have experience on her side as she competes in her 18th career Masters final in search of her ninth title at the elite level.

Halep lost the opening set against Pegula in 35 minutes but levelled at a set apiece thanks to an early break in the second.

Halep missed two match points on her opponent's serve and swiped her racquet angrily on the cement as Pegula held for 4-5 in the third.

"The fire is back, it's a good sign if I do that," said the Romanian, who was supported by a sizeable number of compatriots in the stands.

Halep clinched the win on her third opportunity as Pegula hit the net with a return.

"I changed a little bit the tactics," Halep said.

"In the first set, it was a little bit too fast."

"She was hitting super strong and I didn't feel the rhythm. Then I just calmed down and I tried to just push her back a little bit more."