PARIS—Serena Williams’ wait for a record-equalling 24th Grand Slam singles title goes on after the American was beaten 6–3 7–5 by an inspired Elena Rybakina in the French Open fourth round on Sunday. From the moment the 21-year-old Rybakina, playing in only her seventh Grand Slam main draw, held her opening two service games without dropping a point, Williams looked in peril. And so it proved as seventh seed Williams bowed out to add yet another twist to a wildly unpredictable women’s event. With so many big names having fallen, including Victoria Azarenka early in the day, a prospective quarter-final opponent for Williams, the path to the final looked enticing. But Williams, whose last Grand Slam title came in 2017 at the Australian Open, was unable to find her A game. She remained philosophical in defeat, however, saying that her expectations coming into the tournament had not been high. “I’m …