Having lost five of seven competitive matches this season, the hosts hoped to revive their ailing campaign with a strong showing against one of the tournament favourites, and the early signs were positive.
With a lack of attacking prowess to defend against, Roma’s biggest struggle was staying out of the referee’s notebook, as they picked up three bookings in the opening 45 minutes.
Lorenzo Pellegrini was introduced as a half-time substitute and the captain was once again the catalyst for success.
Just seven minutes into the second half, Pellegrini’s fizzing corner was met at the near post by Evan Ndicka, and the Ivorian firmly planted his header in the Nice goal.
Three minutes later, Mancini smashed home an unstoppable volley.
Seemingly defeated, Franck Haise’s men received a lifeline when substitute Niccolo Pisilli inexplicably pushed Antoine Mendy in the box. Terem Moffi slotted home the resulting penalty, but Roma held out.