(Photo credit: Mike Frey-Imagn Images)No. 3 seed Coco Gauff defeated Czech Karolina Muchova 6-1, 3-6, 6-3 on Sunday at the Australian Open, and that could be a sign of big things to come in Melbourne for the 21-year-old American.The victory puts Gauff into the quarterfinals and improved her record against the 19th-seeded Muchova to 5-0. In the four previous tournaments in which she faced Muchova, Gauff ha
