Coco Gauff battled her way to the quarterfinals of the Porsche Grand Prix on Wednesday with a hard-fought 6-3, 4-6, 7-5 win over compatriot Sachia Vickery. The 134th-ranked Vickery created 19 break points but could only convert seven of them against the world No. 3. Gauff had 15 double faults in the match, but rallied from 4-2 down in the final set before winning in 2 hours, 26 minutes with her first match point. Read this story