Stefan Kozlov upsets 4th-seeded Steve Johnson at Ricoh Open

THE HAGUE, Netherlands (AP) Wild card Stefan Kozlov upset fourth-seeded Steve Johnson 6-3, 6-4 to reach the quarterfinals of the Ricoh Open on Wednesday.

Second-seeded Bernard Tomic had a routine 6-4, 6-3 win over Aljaz Bedene, fifth-seeded Sam Quarry fired 11 aces and never faced a break point in beating Tatsuma Ito 6-3, 6-4 and eighth-seeded Nicolas Mahut also made the last eight by defeating Paul-Henri Mathieu 4-6, 6-1, 6-4.

On the women's side on the Rosmalen grass courts, third-seeded Kristina Mladenovic rallied to beat qualifier Natalia Vikhlyantseva 5-7, 6-3, 6-4.

Sixth-seeded CoCo Vandeweghe beat Nao Hibino 6-2, 6-3 and Madison Brengle outlasted Richel Hogenkamp 7-5, 5-7, 7-5.