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The world No.1 recovered from losing the opening set to prevail 4-6 6-3 7-5 after two-and-a-half hours.

In the first meeting between the players, Andreeva made a positive start as she broke her opponent in the third game, while saving two break points in the sixth and 10th to draw first blood.

That sparked Swiatek into life. A break in the opening game of the second set proved enough for the four-time French Open champion to level the contest.

The Pole broke again in the decider and, after Andreeva squandered the opportunity to break back at 6-5 by sending a backhand long, she won the next two points to advance to the semi-finals. 

Matching her performance from last year in Cincinnati, where she was beaten in the last four by Coco Gauff, Swiatek will hope to go the extra steps this time around.

The Pole maintained her perfect quarter-final record in 2024, having now won all 10 such matches, and is now 16-1 at this stage in WTA 1000 events, with her only defeat coming against Elena Rybakina by retirement in Rome last year.

With her 30th main-draw victory at a WTA 1000 this season, she becomes only the second player after Serena Williams (36 in 2013) to reach that tally in a single year.

Swiatek has also now reached the highest percentage of semi-finals since the format's introduction in 2009 (17 from 31, 54.8 per cent).