Iga Swiatek had to mount a comeback to beat Marta Kostyuk in three sets and book her place in the Canadian Open quarter-finals.

Kostyuk made a strong start but could not maintain that level as Swiatek responded to claim a 3-6 6-1 6-2 victory in two hours and 11 minutes.

There were seven breaks of serve in the first set, with Swiatek drawing first blood and neither player able to hold across the first four games.

After going 2-1 down, Kostyuk won three straight games to find the edge and eventually got over the line in the ninth game, fending off four more break points in the process.

Swiatek bounced straight back, starting the second set by winning the first three games before Kostyuk got on the board.

The Pole then won three more in a row, but to take the set, she had to defend three break points and saw three set points go to waste before she converted the fourth.

Swiatek then reeled off five straight games in the decider, and though she saw five match points go begging, she eventually made the sixth count to make it through to the last eight.

JAZDA! @iga_swiatek fights back to defeat Kostyuk 3-6, 6-1, 6-2 and books her spot into the final eight in Toronto.#NBO26 pic.twitter.com/4H9ab49W6n

— wta (@WTA) August 8, 2026

Swiatek's consistency continues to show

Swiatek has become the third player since the format's introduction in 2009 to reach 4+ WTA-1000 quarter-finals in at least five consecutive years (2022-2026) after Agnieszka Radwanska (2009-2014) and Simona Halep (2014-2019).

And only Radwanska (35) has made more WTA-1000 quarter-finals than Swiatek (29) before turning 26 years old.

She also now has the best percentage of WTA-1000 quarter-finals reached (61.7%, 29/47), surpassing Serena Williams (61.2%, 30/49) since the format's introduction.

Swiatek did not have it all her own way, though, facing 13 break points – of which she saved nine – while she could only convert eight of the 15 she forced.

She will now face either Jessica Pegula or Diana Shnaider for a place in the final four.