Coco Gauff, the youngest player at the Australian Open, made it to the fourth round in her biggest performance yet. The 15-year-old ousted defending Japanese champ Naomi Osaka. Meantime, Serena Williams' quest for a 24th Grand Slam singles title at the Open is over. She suffered a shocking upset to China's Wang Qiang, marking her earliest exit at Melbourne Park in 14 years.
