TOKYO—It wasn’t the ending that Naomi Osaka—nor her multitudes of fans across Japan and worldwide—had expected. The start of the Tokyo Olympics, however, will forever be a bright memory for the tennis superstar. Osaka herself said after lighting the Olympic cauldron during last week’s opening ceremony that it was “undoubtedly the greatest athletic achievement and honor I will ever have in my life.” So maybe—just maybe—that will allow Osaka to cope with her unexpected 6–1, 6–4 loss to former French Open finalist Marketa Vondrousova of the Czech Republic in the third round of the Olympic tennis tournament on Tuesday. Not immediately, though. “I’m disappointed in every loss, but I feel like this one sucks more than the others,” Osaka said. As a four-time Grand Slam champion, the highest-paid female athlete in the world and the host country’s poster girl for the Games, the huge expectations were hard to handle. “I …