Balotelli only started the game after Giampaolo Pazzini broke down in the pre-match warm-up.
"I was supposed to be on the bench, but then Pazzo hurt himself so I played instead," Balotelli told Sky Sport Italia.
"I'm happy it turned out like that, as I put in a good performance. We are strong in attack, even if I haven't played much and feel my legs are heavy. I must work to improve my fitness levels.
"It is a good start, but now I must continue scoring goals. We created a great deal this evening, but Daniele Padelli performed some good saves.
"We deserved to win and in the end we did it."