Serena Williams will not be travelling to Tokyo for the Olympic Games, the 23-times Grand Slam singles tennis champion said on Sunday without giving the reasons behind her decision. Williams, who will turn 40 in September, won the singles title at the London Olympics in 2012 and she has also picked up three gold medals in doubles with sister Venus—in Sydney (2000), Beijing (2008) and London. “Yeah, I’m actually not on the Olympic list, so… Not that I’m aware of. If so, then I shouldn’t be on it,” Williams told reporters on the eve of the Wimbledon Grand Slam. Top men’s players such as Rafa Nadal and Dominic Thiem have also opted to skip the Tokyo Games, which start on July 23. Roger Federer, a 20-times major winner who also turns 40 in August, said he would like to go to the Olympics but would make a final call after …