As the world No. 1 approached his bench during a second-set changeover, he took his racquet back and smashed it against a Perrier sign on the bottom of the seat.
He prefers San Pellegrino, perhaps?
Djokovic received a warning for racquet abuse after the incident, though the signage seems to have received the brunt of it.
While the players were sent off the court during a rain delay, the bench was replaced.