Coco Gauff pays attention to what people say about her online and occasionally takes pleasure in clapping back.

Coco Gauff became the youngest WTA Finals winner since Maria Sharapova in 2004 on Saturday at age 20, and the first American woman to capture the year-ending tournament since Serena Williams in 2014.

On Saturday, the 20-year-old survived a three-hour thriller in the Riyadh final and edged out Zheng Qinwen 3-6 6-4 7-6 (2). A couple of times during the match, the American had her back turned against the wall but managed to come back and ultimately win.