Novak Djokovic was featured on the Apple documentary on
Boris Becker and in it Becker spoke about Djokovic as a very emotional player.
Novak Djokovic hasn't been a crowd favourite for much of his career if at any point. The Serbian often finds himself playing against the crowd too and he never felt it as much as during the iconic Wimbledon final against Federer. That match was referenced in the recent Boris Becker documentary with both the Serbian and the German talking about it.
Becker noted Djokovic as very emotional:
"Novak is very emotional. He always gets temperamental when the crowd supports the other guy. And he's using that to show with his fingers off into the crowd that you have woken me up now. I'm going to beat this guy."
Djokovic himself commented on being emotional on the court by explaining:
"It's a battle. It's a fight. Unpredictable things happen. Somebody takes you out of your comfort zone, right?"