British primary Johanna Konta was overwhelmed 3-6 7-6 (7-5) 6-2 by Karolina Muchova within the first spherical of the Cincinnati Open.
Konta, 30, gained the primary set in an assured begin earlier than rain interrupted the second set in Ohio.
After the resumption, Czech Muchova, 24, claimed the second set in an in depth tie-break.
The world quantity 23 took the deciding set and can face former US Open champion Bianca Andreescu in spherical two.
Within the males’s match in Cincinnati, British quantity two Cameron Norrie couldn’t convert a set’s result in victory as American John Isner fought again to win 4-6 7-6 (7-5) 6-4.
Andy Murray, who beat Richard Gasquet in his opening match, will play ninth seed Hubert Hurkacz within the Wednesday’s second spherical after the Pole defeated Alejandro Davidovich Fokina of Spain.
Konta has had a troubled season, with no back-to-back wins and lengthy damage breaks earlier than she gained the Nottingham Open this summer time, her first title since profitable the Miami Open in 2017.
However her plans to make use of that momentum at Wimbledon have been crushed after she was recognized as an in depth contact when a member of her crew examined optimistic for Covid-19.
She needed to then withdraw from the Tokyo Olympics as she would have little time to organize after recovering from the virus herself.
Konta appeared to be returning to type on the Canadian Open however a knee damage lower brief her marketing campaign.
In a second-tier match in Chicago, 18-year-old Briton Emma Raducanu beat top-seeded Belgian Alison van Uytvanck 7-6 (9-7) 6-3 to make the second spherical.
Raducanu, who reached the fourth spherical at Wimbledon earlier this 12 months in solely her second skilled match, made up 124 rating spots to beat the world quantity 60.
She’s going to play 20-year-old Clara Burel of France subsequent.