Johanna Konta’s wait to break into the top 10 of the WTA rankings goes on after she was knocked out of the Western & Southern Open by Agnieszka Radwanska.
The Brit began brightly against her Polish opponent and won a one-sided tie break 7-1 to take an early advantage.
She claimed just four more games, however, as Radwanska came back to secure a 6-7 6-4 6-0 victory.
Konta needed to reach at least the semi-finals in Cincinnati to have a chance of moving into the top 10 for the first time.
Instead, the current 13th-ranked player fell short of a spot in the quarters as she lost each of the last nine games to drop out.
Radwanska said: “She’s a great player. We never played before, but I’ve seen many of her matches, and she’s played great tennis.
“I knew it wouldn’t be easy, and it was an exciting match playing together for the first time. I’m just so happy with the win. It was a very tight match in the beginning.
“The tie-break slipped away too quickly, that’s for sure. I was able to break at the end of the second set, and I think I started to play better tennis and much more aggressive.”
Radwanska meets Simona Halep next after she extended her winning run to 12 matches with a comfortable 6-1 6-2 victory over Daria Gavrilova.
Angelique Kerber‘s bid to replace Serena Williams as world No 1 will continue against Carla Suarez Navarro after beating Barbora Strycova 7-6 6-4.
Fourth seed Garbine Muguruza faces qualifier Timea Babos having seen off Anastasia Pavlyuchenkova 7-5 6-1. Babos shocked Dominika Cibulkova 4-6 6-3 6-1.
The remaining quarter-final will see Karolina Pliskova face Svetlana Kuznetsova following their respective wins over Misaki Doi and Timea Bacsinszky.