LONDON, United Kingdom — Serena Williams could be forced to pull out of the Wimbledon doubles event after the American legend suffered a knee injury in her first-round singles defeat. Williams, playing her first singles match in four years, was beaten by Australia's Maya Joint in a three-set epic on Centre Court late on Tuesday evening (Wednesday Manila time). The 44-year-old, who retired in 2022, made a sensational comeback in June, playing doubles tournaments at Queen's Club and Berlin.