Sun Xinran, the 16-year-old junior U.S. Open champion, is making the most of her WTA Tour debut

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, a 16-year-old home hope has been making the most of a wild card at the China Open. Elsewhere, court shadows are causing problems for viewers at home and

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