Swiatek will take on Elena Rybakina for the title at the U.S. Open tune-up event after the Australian Open champion beat Coco Gauff 5-7 6-2 6-2.

Swiatek, who won ​one of her six Grand Slam titles in Flushing Meadows in 2022, secured the rain-delayed ​first set in Toronto before Svitolina turned the tables and broke the Pole twice ⁠in a one-sided second set.

Svitolina broke to grab a 3-2 lead in the decider but former ​world number one Swiatek reeled off the final four games to claim victory.

"After that second set ​I knew I had to do everything I could to get my rhythm and my game back," she told Tennis Channel.

"It's not easy to do that during a match - to keep your calm and your composure and follow ​the plan. I'm happy in the third set I did that and it paid off in ​the end. I didn't doubt myself."

Swiatek has had an inconsistent season, failing to advance beyond the quarters at ‌a Grand ⁠Slam and replacing her coach after a surprise second-round defeat by compatriot Magda Linette in Miami.

In Wednesday's other semi-final, Gauff edged a tight opening set but the American's game fell apart after her serve was broken in the second, as Rybakina won five straight games to level the contest.

Kazakhstan's Rybakina, the ​2022 Wimbledon winner, broke ​twice in quick succession ⁠to take command of the third set and fought off a couple of break points to serve out the win.

The only previous meeting between Gauff ​and Rybakina also came in Toronto in 2022, which the American won ​in three ⁠sets.

"Last time we played, it was such a battle and even in practice, it's always a close match," world number two Rybakina said.

"I feel like in the first set we were playing well but ⁠then I ​rushed it a little bit. I'm just glad that I ​managed to win again in three sets," added the world number two, who was taken to three sets for a ​fourth time in the tournament.