Coming next week: Tursunov Q&A

   I'll post a three-part Q&A with former top-20 player Dmitry Tursunov, a 34-year-old Russian with strong Northern California ties, next week.
   Part I -- Tursunov's long history of injuries, the biggest highlight and disappointment of his career, and his plans.
   Part II -- The Big Four, whether champions are born or made, John McEnroe's provocative comment about Serena Williams, the Margaret Court controversy, equal prize money for men and women, and proposals to speed up matches.
   Part III -- Russia's doping problem in Olympic sports, its alleged interference in last year's U.S. presidential election, Donald Trump, Vladimir Putin and climate change.