Djokovic was clearly tense during a four-sets win over the Italian and had angrily lambasted his box after failing to convert a match point before damaging the side of the court.
After sealing the 6-2 6-3 6-7 (5-7) 7-5 win just moments later, Djokovic exploded again, roaring up at his box with his veins bulging.
It was a curious match between the world No. 1 and the ninth seed.
Djokovic appeared in total control when two sets to love up but his Italian opponent refused to lie down.