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Bundled out of Europe by Ajax last week, Massimiliano Allegri's men completed a domestic formality thanks to Alex Sandro's first-half header and a German Pezzella own goal eight minutes after the interval.

One point stood between Juve and an eighth-successive Scudetto and it was made to work for all three after Nikola Milenkovic's surprise sixth-minute opener.

The woodwork twice prevented Federico Chiesa from making life more difficult for the Bianconeri, but they shook off the lethargy in the second half to open an insurmountable lead over second-place Napoli.

Juve's confidence, diminished after its loss to Ajax, ebbed further when Chiesa's cross broke perfectly for midfielder Milenkovic to sweep home.

Fiorentina, in contrast, grew in stature, with a combination of the offside flag and the right post denying Giovanni Simeone and winger Chiesa.

The hosts needed inspiration and Alex Sandro provided it with a diving near-post header from Miralem Pjanic's corner in the 37th minute, yet Fiorentina would have surged ahead again had the crossbar not kept out Chiesa's thumping strike.

The tension was released soon after the interval. Cristiano Ronaldo found space to the right of goal and defender Pezzella turned the attacker's pass into his own net.

Juve was suddenly emboldened by belief and Pjanic, Ronaldo and Juan Cuadrado all saw shots blocked in quick succession.

The home side's Portuguese superstar ultimately went unrewarded in his attempts to score his 600th club goal, but that can be put on hold as the Bianconeri uncork the champagne.

Allegri was forced to defend his Juve record after the surprise quarter-final exit to Ajax in the UEFA Champions League.

While continental success is still clearly the major prize, the ex-AC Milan boss deserves his share of plaudits for juggling egos and orchestrating the most serene of title triumphs, his sixth overall in Serie A.