Juventus took another step towards the Serie A title, moving 17 points clear at the top with a battling 1-0 win over Genoa.
The Bianconeri are running away with the Scudetto and there is practically no doubt that they will retain their supremacy in Italy.
But Antonio Conte's men were made to dig deep by a spirited Genoa side who pushed them all the way at Marassi.
On the night that goalkeeper Gigi Buffon matched Dino Zoff's 476 appearances in a Juventus shirt in all competitions, he was called upon to save a penalty from Emanuele Calaio after Arturo Vidal was adjudged to have handled.
The penalty was struck centrally and gave Buffon the chance to parry it and keep the game level.
Just as the game looked to be headed for a draw, Juventus were awarded a free-kick and Pirlo showed why he is regarded as one of the game's greatest set-piece strikers.
The ex-Milan man stepped up and curled the ball to perfection into the corner where Mattia Perrin couldn't reach, securing all three points.
"Well done to Genoa for the way they performed but we wanted to continue our winning streak."
Watch Pirlo's perfect free-kick: