(CNN) — Coco Gauff kicked off her career as a grand slam champion with a straight-sets victory against Ekaterina Alexandrova at the China Open. Playing her first match since winning the US Open last month, Gauff overcame Russia’s Alexandrova 7-5 6-3 in Beijing on Monday, though she later admitted that she wasn’t at her “best level.” The 19-year-old American […]