Top-ranked tennis player Jannik Sinner has accepted a three-month ban in a settlement with the World Anti-Doping Agency, the organization said Saturday. WADA had challenged 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. Sinner’s explanation — that trace amounts of Clostebol in his doping sample was due to a massage from a trainer who used the substance after cutting his own finger — was accepted.