Serena Williams has again hit out at the frequency with which she is selected for anti-doping tests. The Wimbledon runner-up took to Twitter on Tuesday night after she received another visit from a ...

Serena Williams has slammed the drug test rules that force tennis stars to declare their location to doping officials, claiming the "unprofessional" system stopped her coming out of retirement sooner.

SERENA Williams has spoken out about being drug tested before — insinuating they’re not ‘random’ — and she’s just launched another scathing attack at the process. In a series of tweets fired on ...