The Spaniard swept home Juan Cuadrado's cross to finally break the deadlock in a poor game at the Stadio Olimpico, as the Bianconeri toiled in the absence of some key players.
The Spaniard swept home Juan Cuadrado's cross to finally break the deadlock in a poor game at the Stadio Olimpico, as the Bianconeri toiled in the absence of some key players.
The Giallorossi ran out comfortable winners at the San Siro on Saturday, but Napoli's victory over Frosinone means the capital club were unable to overhaul them in second.
The striker hit the winner in a dramatic finish in Florence as the visitors moved 12 points clear at the top and will be crowed champions if Napoli fail to win at Roma on Monday.
Sinisa Mihajlovic's side were unable to take advantage of their better openings at San Siro after two goals early on in the fixture failed to decide the winner.
The Argentinian netted a brace and Patrice Evra, Giorgio Chiellini and Leonardo Bonucci scored as Max Allegri's outfit ended another successful season on a high.
The Serie A leaders took another step towards retaining their title with a comfortable victory in Turin that leaves them with a healthy lead with just four games left to play.
While the keeper passed a memorable milestone, the Bianconeri's forwards ran riot as they secured a straightforward victory to enhance their title hopes.
The hosts are already resigned to playing next season in Serie B, but they put in a stellar performance to down the champions after the former Italy international struck.
The Old Lady extended their lead at the top of Serie A with a comfortable win over Palermo, who remain in serious danger of slipping out of Italy's top flight.
The Nerazzurri took the lead through Ivan Perisic but were unable to hold onto their lead in a game that ended in a stalemate – a result that benefits neither team.