PARIS, May 29 : Victoria Mboko said it was up to American great Serena Williams to announce her comeback to the sport as media speculation intensified about their potential doubles partnership at next month's Queen's Club Championships in London. Williams, who won the last of her 23 Grand Slam singles titles in 2017 and has not competed since the 2022 U.S. Open, can officially enter tournaments after rejoining the tennis anti-doping testing pool last year. The 44-year-old said in August 2022