Benoit Paire went out of the Argentina Open in bizarre fashion after being docked a point for spitting and then appearing to give up in his final service game.
The tournament supervisor was called in an attempt to calm the Frenchman down.
Paire, 31, then served two wild double faults to lose 4-6, 6-3, 6-1.
The flashpoint in the second-round tie came when a serve from world number 137 Cerundolo, 22, was deemed an ace in the second set.
Paire argued with Forcadell, pointing to a mark in the clay where he thought the ball had landed.