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The draw left Napoli, the only team who can catch league leaders Juventus, six points behind the Turin side with two games left to play.
As the teams are level on their head-to-head record, goal difference would decide the winners if they finished with equal points and Juve are currently 16 goals better off than Napoli.
Dries Mertens and substitute Marek Hamsik scored for the hosts but Torino replied each time with goals from Daniele Baselli and Lorenzo De Silvestri.