Coco Gauff enjoyed a successful start by beating Jessica Pegula 6-3, 6-2 in an American matchup at the WTA Finals on Sunday. Second-seeded Iga Swiatek rallied to beat Barbora Krejcikova 4-6, 7-5, 6-2 in her first match in two months. Gauff converted five of her eight break-point opportunities to win her opening match at the year-ending tournament for the top eight ranked players.