US Tennis star, Serena Williams, has lamented over the procedure at which the sport players are randomly tested, describing her case as a “discrimination.” In a post on her Twitter page on Tuesday, Williams claimed that she is the most drug-tested tennis player after the doping officials took her samples. Her tweet read, “…and it’s that time of the day to get “randomly” drug tested and only test Serena. Out of all the players it’s been proven that I’m the one getting tested the most. Discrimination? I think so. At least I’ll be keeping the sport clean.” The American had previously expressed frustration about the volume of her tests earlier this month. An article published in June revealed that Williams, a 25-time Grand Slam winner, had been tested out of competition by the US Anti-Doping Agency (Usada) on five occasions in 2018.