Reaction from American teenager Coco Gauff after she produced a serving masterclass to reach her first Grand Slam quarter-final on Monday with a 6-3, 6-1 victory over Ons Jabeur of Tunisia. 17-year-old Gauff lost only nine points on serve in her 5-minute victory. Gauff also had a quick match in the previous round - Jennifer Brady retired with an injured left foot after Gauff had won the opening set. Gauff will next face Barbora Krejcikova. The Czech world number 33 also reached her first quarter-final at a major by beating 2018 French Open runner-up Sloane Stephens 6-2, 6-0.