CHARLESTON, S.C. — Defending champion Kiki Bertens and third-seeded Aryna Sabalenka, both among the top 10 players in the world, lost Thursday at the Volvo Car Open.
Bertens, the second seed of the Netherlands who's No. 6 in the WTA rankings, fell to 15th-seeded Maria Sakkari of Greece 7-6 (8), 6-3. Sabalenka, the world's 10th ranked player from Belarus, was defeated by Monica Puig of Puerto Rico 6-2, 7-5 at the season's first clay-court event.
American Sloane Stephens, the top seed and highest ranked player remaining in the field at No. 8, faces 14th-seeded Ajla Tomljanovic of Australia for a spot in the quarterfinals in a later match.