By Jon Wertheim Nick Kyrgios didn’t disappoint on the big stage, but Djokovic’s experience and composure in key moments locked up his seventh Wimbledon crown and 21st Grand Slam title. WIMBLEDON, England—The men’s singles final Sunday lived up to its billing. There was entertainment. There was incredibly clean and creative tennis, starting with a real flourish of Nick Kyrgios’s style edging Novak Djokovic’s substance and experience in the first set. There were no outrageous outbursts or a player rifling balls at his opponent. No one “throwing a match.” In fact, there were small moments when Ky…