Naomi Osaka loses in US Open second round to Karolina Muchova

NEW YORK  — Seemingly back in her U.S. Open match, suddenly a point from getting to a third set, Naomi Osaka lost her way Thursday night, missing forehand after forehand until she ceded that game and chucked her racket, sending it clattering on the Arthur Ashe Stadium court. Not much later, she was out of