LONDON, United Kingdom (AFP) — 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. Williams will play her first singles match since 2022 when the American legend faces Australia's Maya Joint in the Wimbledon first round on Tuesday. The 44-year-old has made a sensational comeback after four years in retirement, far playing doubles at Queen's Club and Berlin before deciding to step up her return at Wimbledon, where she will also compete with sister Venus in the doubles.