Emma Raducanu gave Iga Swiatek arguably her stiffest test this year as she fell to a 6-4 6-4 defeat to the world No 1 at the Porsche Tennis Grand Prix in Stuttgart on Friday.
Raducanu won back-to-back matches for the first time in six months to reach the quarter-finals in Germany but despite falling to defeat against the Pole, the British No 1 will be encouraged by her display on the indoor clay this week.
The formidable Swiatek extended her winning streak to 21 matches and consecutive set streak to 28, although she dropped a total of eight games to Raducanu having lost just three in her previous six sets.
The result means Johanna Konta remains the last British woman to defeat a current world No 1, Konta beating Angelique Kerber at Eastbourne in 2017.
Playing in her first WTA event on clay, Raducanu lost her serve in the opening game of the match and Swiatek dropped just three points on serve to comfortably take the first set.
Raducanu was also broken in the first game of the second set but broke back immediately to love, only to drop serve in the next game before leaving the court for a medical time-out.
Swiatek held serve comfortably when play resumed but had to save two break points in both the eighth and 10th games to seal victory against the US Open champion.
Having lost just three games in her previous six sets, Swiatek said during an on-court interview: "I'm pretty happy that today's match was longer because it's going to give me a lot of experience.
"Playing here is never routine because the surface is really tricky."
The only previous meeting between Swiatek and Raducanu had come in the quarter-finals of the girls' singles at Wimbledon in 2018, when Swiatek won 6-0 6-1.
Great Britain's Cameron Norrie overcame
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