Coco Gauff sinks Aryna Sabalenka to set up WTA Finals showdown with Zheng

American outlasts world No 1: 7-6 (4), 6-3 in RiyadhZheng Qinwen beats Barbora Krejcikova in first semiWhen Aryna Sabalenka and Coco Gauff stared each other down just a month ago in Wuhan, Gauff clearly had the edge as she methodically established a set and break lead. But then, out of nowhere, her serve spectacularly crumbled. Although she fought valiantly until the end, she was torpedoed by an astounding 21 double faults.Having already been a presence on the tour for half a decade, it is somet