Alexander Zverev clinches year-end No. 1 ranking

SHANGHAI — Alexander Zverev clinched the year-end No. 1 ranking on Monday to cap a breakout year in which he won his first two Grand Slam titles. Helped by a season-ending injury to Jannik Sinner, the 29-year-old Zverev will become the oldest player to achieve the year-end honor for the first time, the ATP Tour