SHENZHEN, China (AP) — Defending champion Elina Svitolina stretched her unbeaten run at the WTA Finals into a new year, beating Karolina Pliskova 7-6 (12), 6-4 in her opening match Monday at the season-ending tournament. Svitolina, the only player in this year’s field who has not won a title this season, was unbeaten in the […]