Top-ranked tennis player Jannik Sinner will go to sport’s highest court in April for the World Anti-Doping Agency’s appeal that seeks to ban him from the sport for at least one year. The Court of Arbitration for Sport said Friday it scheduled a closed-doors hearing on April 16-17 at its headquarters in Lausanne, Switzerland. WADA is challenging a decision last year by the International Tennis Integrity Agency not to suspend Sinner for what it judged was accidental contamination by a banned anabolic steroid last March.