| Doubles | |
|---|---|
| 1990 Torneo Internazionale Città di Firenze | |
| Champions |  Sergi Bruguera  Horacio de la Peña |
| Runners-up |  Luiz Mattar  Diego Pérez |
| Score | 3–6, 6–3, 6–4 |
| Draw | 16 (1Q) |
| Seeds | 4 |
Mike De Palmer and Blaine Willenborg were the defending champions, but none competed this year.
Sergi Bruguera and Horacio de la Peña won the title by defeating Luiz Mattar and Diego Pérez 3–6, 6–3, 6–4 in the final. [1]
Gustavo Luza / 
Udo Riglewski (quarterfinals)
Mark Koevermans / Javier Sánchez (quarterfinals)
Omar Camporese / Guillermo Pérez Roldán (quarterfinals, retired) Juan Carlos Báguena / 
Carlos di Laura (quarterfinals)| First round | Quarterfinals | Semifinals | Final | ||||||||||||||||||||||||
| 1 | G Luza U Riglewski | 6 | 6 | ||||||||||||||||||||||||
E Bengoechea  F Segărceanu | 3 | 1 | 1 | G Luza U Riglewski | 4 | 4 | |||||||||||||||||||||
 F Nilsson T Svantesson | 4 | 7 | 6 | F Nilsson T Svantesson | 6 | 6 | |||||||||||||||||||||
S Colombo  H Skoff | 6 | 6 | 4 | F Nilsson T Svantesson | 5 | 5 | |||||||||||||||||||||
| 4 | JC Báguena C di Laura | 6 | 6 | S Bruguera H de la Peña | 7 | 7 | |||||||||||||||||||||
F Clavet  A Sznajder | 4 | 2 | 4 | JC Báguena C di Laura | 5 | 3 | |||||||||||||||||||||
| S Bruguera H de la Peña | 6 | 5 | 6 | S Bruguera H de la Peña | 7 | 6 | |||||||||||||||||||||
JF Altur  C Pioline | 2 | 7 | 2 | S Bruguera H de la Peña | 3 | 6 | 6 | ||||||||||||||||||||
| L Mattar D Pérez | 6 | 6 | L Mattar D Pérez | 6 | 3 | 4 | |||||||||||||||||||||
| J Clavet M Górriz | 4 | 3 | L Mattar D Pérez | 6 | |||||||||||||||||||||||
 R Agénor F Davín | 3 | 4 | 3 | O Camporese G Pérez Roldán | 3 | r | |||||||||||||||||||||
| 3 | O Camporese G Pérez Roldán | 6 | 6 | L Mattar D Pérez | 7 | 6 | |||||||||||||||||||||
| Q | N Kulti M Larsson | 6 | 6 | Q | N Kulti M Larsson | 6 | 4 | ||||||||||||||||||||
| M Cierro A de Minicis | 1 | 4 | Q | N Kulti M Larsson | 6 | 6 | |||||||||||||||||||||
| R Acioly C Motta | 2 | 6 | 2 | M Koevermans J Sánchez | 2 | 4 | |||||||||||||||||||||
| 2 | M Koevermans J Sánchez | 6 | 7 | ||||||||||||||||||||||||
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