ROME (AP) — Naomi Osaka says she felt like she had “a 20-pound vest on” for her show-stopping outfit at the Met Gala — which she labeled “the Grand Slam for all fashion.” “My outfit was so heavy,” she said with her tennis clothes back on at the Italian Open on Friday. “I felt like I had like a 20-pound vest on. But I just kept trying to tell myself to have good posture because tennis players ... sometimes we hunch over a lot.” At Monday’s event in New York, Osaka stunned in a edgy Robert Wun