For all of Novak Djokovic’s titles (100 in all) and Grand Slam trophies (24) and weeks at No. 1 (428, more than anyone else in tennis history), for all of his talent and determination, the guy still can find himself worrying about what is going on with his game.

For all of Novak Djokovic’s accolades – 100 career titles, 24 Grand Slam trophies, a record 428 weeks at No. 1 – the man still sometimes

Ahead of their French Open quarterfinal on Wednesday, Alexander Zverev isn’t buying the idea that Novak Djokovic is a “dark horse” to win a record 25th major title. “I mean, the guy [has] won 24 Grand Slams,” Zverev told reporters. "He’s never going to be a dark horse.