Qatar Open: Collins eases past Siniakova to reach quarter-finals

American qualifier Danielle Collins beat Katerina Siniakova 6-4, 6-3 to reach the quarter-finals of the Qatar Open at the Khalifa International Tennis and Squash Complex in Doha.

Collins, ranked No 63, will play Russian Anastasia Pavlyuchenkova next.

Earlier in the tournament, the American defeated Russian Veronika Kudermetova, the No 13 seed (7-5, 6-3) and Marie Bouzkova (6-4, 7-5).

Siniakova, ranked No 42, beat Croat Donna Vekic (7-5, 6-1) and American Coco Gauff, the second seed (6-2, 6-4) in the previous rounds of the Qatar tournament.

Doha WTA 1000, other last-16 results (Khalifa International Tennis and Squash Complex, hard, USD 3.211.715, most recent results first):

• Victoria Azarenka vs. Jelena Ostapenko
• Iga Swiatek vs. Ekaterina Alexandrova
• Emma Navarro vs. Elena Rybakina
• Lesia Tsurenko vs. Naomi Osaka
• Karolina Pliskova vs. Linda Noskova: wednesday
• Qinwen Zheng vs. Leylah Fernandez: wednesday
• Anastasia Pavlyuchenkova beat Marketa Vondrousova (6): 7-5, 6-3