Nacer Chadli fired us ahead from the penalty spot as we had the better of the first half.
However, Federico Bernardeschi levelled for Fiorentina via a deflection on 59 minutes and the home team came back into the game in the final half-hour.
Overall, a draw was perhaps about right and the tie will now be decided in the second leg at the Lane on Thursday week, February 25.
Fiorentina (4-2-3-1): Tatarusanu; Tomovic, Gonzalo Rodriguez (c), Astori, Alonso; Costa (Vecino 67), Borja Valero; Blaszczykowski (Kalinic 62), Ilicic (Badelj 61), Bernardeschi; Zarate. Substitutes (not used): Sepe, Fernandez, Pasqual, Babacar.
Spurs (4-2-3-1): Vorm; Trippier, Alderweireld, Wimmer, Davies; Mason (c), Carroll (Dembele 46); Son (Kane 68), Alli, Eriksen; Chadli (Dier 79). Substitutes (not used): McGee, Rose, Walker, Onomah.
Goals: Fiorentina - Bernardeschi 59; Spurs - Chadli 37 (pen).
Yellow cards: Fiorentina - Astori 20; Spurs - Alli 30, Davies 48, Kane 90+3.
Referee: Felix Zwayer (Germany).
Attendance: To follow...
Below: Mousa Dembele takes on Marcos Alonso