Straight after the break, Albert Guðmundsson made his mark and equalised for Fiorentina.
The deciding goal came in stoppage time, when Albert Guðmundsson found the net for Fiorentina to complete Fiorentina's come back.
Looking at the table, we find Fiorentina in 13th place, while Lazio are eighth in the league.
Fiorentina play Empoli on 29 September, Milan on 6 October and Lecce (away) on 20 October. Lazio's next opponents are Torino on 29 September, Empoli on 6 October and Juventus (away) on 19 October.
The away team Lazio held the grip leading with 0-1 in the Serie A game. However, Fiorentina flipped the match into a win with a final score of 2-1.
Lazio took the lead just before half time when Mario Gila Fuentes netted, with an assist by Nuno Tavares.