Welcome back to the Monday Tennis Briefing, where will explain the stories behind the stories from the past week on court. This week, the headline tournaments were Shanghai and Wuhan. Elsewhere, Rafael Nadal’s retirement overshadowed another top player’s departure, a sister act took to the court, and an all-Chinese semifinal capped a great swing for the nation. For all the budding teenage players out there feeling like they will always be behind the alpha dogs among their contemporaries, the Ric