The tennis dialogue between player and coach writ large, by two of its rising stars‎

THE ALL ENGLAND CLUB, London — Want to get one of the rising coaches in women’s tennis into a deep discussion about purpose and passion? Don’t ask Sandra Zaniewska, who coaches the Ukrainian star Marta Kostyuk, about how she helped Kostyuk evolve from a promising talent unable to grasp her potential into a blooming threat in the second week of Grand Slams. Don’t ask her about her playing career, when she became one of the top few hundred players in the world. And don’t ask her about becoming a r