Coco Gauff said a heated exchange with the chair umpire midway through her match with Karolina Pliskova on Wednesday had spurred her on to complete a 2-6 6-4 6-3 victory and reach the quarter-finals of the Dubai Tennis Championships.

The U.S. Open champion lost the first set but was leading 4-2 in the second when her first serve at deuce, which Pliskova returned into the net, was called out.