There was a real sense of anticipation in the Stadio Diego Armando Maradona after the earlier house loss of Inter Milan for Roma, and it took only seven minutes for Gli Azzurri to inspire delightful parties.
Andre-Frank Zambo Anguissa burst into the box to meet the ball of Giovanni di Lorenzo with a first pass to McTominay, who made no mistake with his finish.
His countryman Che Adams missed a big chance shortly afterwards, and Eljif Elmas then blocked a shot.
Contrary to what the final score suggests, both teams had periods in which they controlled the possession, and Romelu Lukaku almost stole it from Guillermo Maripan when he cut away the pass from the Center-Rug in his own box, but was annoyed when the ball bounced out of the game.
Napoli, however, remained patient and was rewarded in the 42nd minute when McTominay came to the score sheet again, covered the cross of Matteo Politano reached for Cesare Casadei and applied another clinical first finish.
Torino saw a lot of the ball after the restart, but was still unable to work Alex Meret, with Alessandro BuongiNo authoritarian blocking the powerful strike of Karol Linetty.
However, there was still a blow to the hosts, in which Anguisissa and BuongiNo were forced out of each other within six minutes.
Yet Napoli still looked comfortable, just like the best encapsulated by Torino who went the entire game without taking a shot on goal, and they struggled to sometimes even get a touch of the ball.
However, there was even more injury concern for Antonio Conte, with Stanislav Lobotka who hurried away in the last minutes, but Napoli did not look restless because they earned their third consecutive victory to lead three points at the top of the table with only four Series A matches that were left over.
Torino, on the other hand, has lost two of their last three games, after having defeated once in their previous 14 games, although they remain 10th.
Flash score Man of the match: Scott McTominay (Napoli)
View all match statistics with flash score.