Rybakina has a good record overall—36-14—but she has just one title, hasn’t made the quarters at a major, and is out of the Top 10 for the first time in three years. Kostyuk has had it worse. After ...

Top-seeded Alexander Zverev of Germany led Francisco Cerundolo 6-4, 1-0 when the 14th-seeded Argentine retired because of an ...