For Novak Djokovic, Two Down and Two, Maybe Three, to Go

He has won the Australian and French Opens but a Grand Slam won’t be easy. He must defend Wimbledon. Then there’s the U.S. Open. And don’t forget about the Olympics.

PARIS — With his 19th career Grand Slam singles title in hand, Novak Djokovic is chasing more tennis milestones unreservedly. No complexes. No playing it cool. “I’ve achieved some things that a lot of people thought it would not be possible for me to achieve,” he said Sunday after winning his second French Open.