Novak Djokovic faces Alexander Zverev in a blockbuster French Open quarter-final as the Serbian continues his bid for a record-extending 25th grand slam singles title.

Novak Djokovic's Behavior After 100th French Open Win is Turning Heads originally appeared on Athlon Sports. Novak Djokovic may be serious on the court, but he knows how to have fun off of it. That much is clear after the Serbian icon made history on Monday with his 100th career win at the French Open.

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.