The Pole then broke Raducanu in the first game of the second set and engineered further break points in the Briton’s next two service games that she was unable to convert as her opponent dug deep.
However, Swiatek went on to clinch victory with a second break in the ninth game to set up a Saturday semi-final with fourth seed Elena Rybakina as she chases a third consecutive title in Stuttgart after beating Aryna Sabalenka in the previous two finals
Raducanu’s two wins in Stuttgart have propelled her to just outside the world’s top 200 as she continues her comeback from ankle and wrist surgery last year, operations that led to the 2021 US Open champion spending eight months on the sidelines.
The way she matched Swiatek at times, and how she dispatched former world No 1 Kerber and this year’s Australian Open quarter-finalist Noskova earlier in the tournament, bodes well.
Swiatek, who took her head-to-head record against Raducanu to 3-0, said afterwards: “It was a pretty intense match.
“I was happy that I was able to keep the intensity even though we played some tough games for like two hours.
“It wasn’t easy. I had a lot of break points which I didn’t convert so still I’m happy that I could finish it with a better score in the second set than in the first.
“There are a lot of factors coming in if you want to stay consistently at the top but I hope [Raducanu] will be able to do it. For sure she has the game but it’s not easy.”
Swiatek also beat Raducanu in the quarter-finals in Stuttgart in 2022 and in the last 16 at Indian Wells last year.
