Roma were trailing 1-0 at half-time, but Vucinic bagged a brace in 10 minutes to turn it around.
âWinning the derby is the greatest feeling you can have in football. The fact it was with two of my goals makes me even happier,â he told Sky Italia.
Lazio could've extended their advantage straight after the restart, but Julio Sergio saved Sergio Floccari's penalty.
âThe save was crucial and really boosted us, as if we had gone 2-0 down I don't know what would've happened.â