WIMBLEDON, England—Nick Kyrgios stepped into a nearly full Centre Court to polite applause at precisely 1:30 p.m. on Monday, exited about 3 1/2 hours later to a louder ovation and, somehow, the 100-year-old stadium survived the experience. In the warmup period, Kyrgios flicked a ball between his legs and closed with an underarm serve, hardly…