MIAMI — After two decades of professional tennis, 99 career singles titles and 24 Grand Slam triumphs, Novak Djokovic has become a mystery — to tennis fans and to himself. Both parties are ...

Novak Djokovic’s quest to win his 100th ATP Tour title, a self-avowed mission, took a sharp, unexpected turn in the Miami Open final, denying the 37-year old Serbian a historic moment just as the ...