Steve Johnson says the Jannik Sinner doping ban ruling "smells fishy" to him as the former American tennis star has some questions. After the WADA lodged an appeal in the ITIA's verdict and said that they would seek a 1-2 year ban for the 23-year-old, the world No. 1 was due to appear in a CAS court between April 16-17.

The men's world No. 1 will miss several tournaments, but no Grand Slams. Here's what to know about the doping proceedings against him.

Jannik Sinner has been dropped from an exhibition event in Las Vegas next month while he is serving a three-month ban connected to a pair of failed doping tests.

Juan Martin del Potro, who called time on his career in December, was quizzed over Jannik Sinner's doping case at the ATP 500 Brazilian Open in Rio de Janeiro.

The timing means the 23-year-old Italian won't miss any Grand Slam tournaments. The French Open, the season's next major, starts May 25.

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.

Jannik Sinner has accepted a three-month ban from tennis to settle a case which has lingered over the sport for months after he twice tested positive for a banned substance, the World Anti-Doping Agency (WADA) announced on Saturday.

Jannik Sinner’s three-month doping ban isn’t sitting right with some in the tennis world. Australian star Nick Kyrgios ripped the World Anti-Doping Agency (WADA), claiming Sinner got off easy with the monthslong suspension over his two positive drug tests.

Many in the tennis world are expressing skepticism with the process that led to Sinner's three-month suspension