Washington, April 17 -- Serena Williams says she would have been banned for 20 years and had some of her Grand Slam titles taken away if she had committed the same anti-doping offence as men's world number one Jannik Sinner.

Italy's Sinner, 23, is serving a three-month doping ban after reaching a settlement with the World Anti-Doping Agency (Wada) over two positive drugs tests last year.

Former world number one Williams, winner of 23 Grand Slam titles, claimed in 2018 that she was a victim of "discrimination" over the volume of drug tests she was required to carry out.

An article published by website Deadspin in 2018 revealed that Williams had been tested out of competition by the US Anti-Doping Agency (Usada) on five occasions by June t...