Spain's Paula Badosa produced the biggest win of her career Friday, upsetting top-seeded Ashleigh Barty of Australia 6-4, 6-3 in the quarterfinals of the Volvo Car Open at Charleston, S.C.
Badosa, a 23-year-old who is ranked 71st in the world, is through to the semifinals of a WTA 500-level event for the first time in her career.
"I can't believe it. I still can't believe I just beat the No. 1 in the world," Badosa said postmatch. "I was nervous, but I served very well, and I think that was the key of the match. It was a tough match, but I was there until the last moment."
Badosa's next opponent will be 15th-seeded Russian Veronika Kudermetova, who beat American Sloane Stephens 6-3, 6-4.
In the other semifinal, 12th-seeded Tunisian Ons Jabeur will oppose Montenegro's Danka Kovinic. Jabeur knocked out 13th-seeded American Coco Gauff 6-3, 6-3, and Kovinic rallied past 11th-seeded Yulia Putintseva of Kazakhstan 6-7 (2), 7-5, 6-1.
Colombian wild-card entrant Maria Camila Osorio Serrano continued her surprise run in Bogota, Colombia, getting past Switzerland's Stefanie Voegele 6-3, 7-5 in the quarterfinals.
Osorio Serrano, ranked 180th in the world, moves on to oppose another unexpected semifinalist. France's Harmony Tan, ranked 190th, cruised past Spain's Lara Arruabarrena 6-1, 6-4.
Fifth-seeded Tamara Zidansek of Slovenia beat Italy's Sara Errani 6-3, 6-4 to set up a semifinal against Bulgaria's Viktoriya Tomova, who came back for a 5-7, 6-2, 6-4 win over Spain's Nuria Parrizas Diaz.
--Field Level Media