The visitors went in front after just six minutes thanks to Nikola Milenkovic, but Alex Sandro headed in an equaliser eight minutes before the break. In the 53rd minute, Ronaldo forced Pezzella’s decisive mistake to become the first player to win the top-division titles in England, Spain and Italy.
Juve’s victory gave them an unassailable 20-point lead over nearest rivals Napoli to prompt another round of title celebrations in Turin.
Juve’s central playmaker proved his worth again when he sent a corner onto the head of Sandro for a first-half equaliser.
Pjanic wasn’t done manufacturing chances, teeing up Juan Cuadrado soon after the goal. The winger blazed over, but Pjanic continued in the same vein in the second half, giving Emre Can a headed opportunity and releasing Federico Bernardeschi with a through pass.
Juve are away to Inter Milan next Saturday. Fiorentina travel to Atalanta for the second leg of the Coppa Italia semi-final on Thursday, with the aggregate score even at 3-3 but La Viola trailing on away goals.