Czech Katerina Siniakova overcame a four-game deficit in the second set to upset second-seeded Coco Gauff 6–2, 6–4 and advance to the third round of the Qatar TotalEnergies Open on Tuesday, Feb. 13, in Doha.
Gauff had a first-round bye and was making her Doha debut against Siniakova. The 19-year-old Gauff struggled in the opening set, facing 10 break points and saving only seven of them.