MELBOURNE, Jan. 23 -- Plenty was going badly for Coco Gauff in the second round of the Australian Open. The double-faults kept coming, nine in all. The deficits, too: first, she dropped the opening set against 74th-ranked Sorana Cirstea. Then, after forcing a third, Gauff fell behind by a break, ceding 14 of 16 points with a series of mistakes. Later, after getting even at 3-3, Gauff was a mere two points from a loss....