WIMBLEDON, England—Serbia’s Novak Djokovic, Switzerland’s Roger Federer, Japan’s Naomi Osaka, and Australia’s Ash Barty are on the entry lists for the Tokyo Olympics that were announced Thursday by the International Tennis Federation. As the ITF noted, though, “The entry lists are still subject to change.” Federer, for one, said last weekend he would wait until after Wimbledon ends on July 11 to decide whether he will head to Japan. Djokovic has made clear he’d like to pursue a Golden Slam, something only Steffi Graf has done, in 1988: winning all four major tennis tournaments and an Olympic singles gold medal in the same year. He collected the titles at the Australian Open in February and the French Open last month and is scheduled to play his third-round match at Wimbledon on Friday. The Olympics will mark Osaka’s return to competition after she withdrew from the French Open following the first …