Welcome back to the Monday Tennis Briefing, where The Athletic will explain the stories behind the stories from the past week on court. This week, the ATP Tour season came to an end ahead of the Davis Cup Finals. The calendar again came under scrutiny, a stacked field revealed a lot about tennis politics, and a women’s star stood up for her nation again. If you’d like to follow our fantastic tennis coverage, click here. What is the future of the tennis calendar? At the ATP Tour Finals last week,.