Jannik Sinner, the world’s No. 1 male tennis player, has accepted a three-month ban from the sport following an anti-doping rule violation. Australian Open champion Sinner, 23, received a sanction in August but was found by the International Tennis Integrity Agency (ITIA) to bear “no fault or negligence” after twice testing positive for clostebol — a banned anabolic steroid — at the Indian Wells Masters 1000 tournament in March.