Top-seeded Angelique Kerber struggled with a knee injury during a 6-3, 7-6 (3) loss to seventh seed Elina Svitolina in the semifinals of the Dubai Tennis Championships on Friday

Top-seeded Angelique Kerber journeyed to her first Dubai Tennis Championships semifinals, while Caroline Wozniacki reached her sixth semi at the tournament

American teen Catherine Bellis captured her first career top 10 win when she upset sixth-ranked Agnieszka Radwanska 6-4, 2-6, 6-2 at the Dubai Tennis Championship

Second-seeded Karolina Pliskova and third-seeded Dominika Cibulkova both lost their opening matches at the Dubai Tennis Championships

In an all-American matchup, Alison Riske upset 11th-seeded Coco Vandeweghe 6-4, 6-4 to move into the second round at the Dubai Championships

Krystyna Pliskova of Czech Republic mounted a comeback to upset 16th-seeded Roberta Vinci of Italy 3-6, 7-5, 6-3 at the Dubai Tennis Championships on Sunday

Top-seeded Angelique Kerber has a chance to reclaim the No. 1 ranking from Serena Williams by winning the Dubai Tennis Championships, which started Sunday