| Singles | |
|---|---|
| 1990 Torneo Internazionale | |
| Champion |  Isabel Cueto |
| Runner-up |  Barbara Paulus |
| Score | 6–2, 6–3 |
| Draw | 32 (1WC / 4Q) |
| Seeds | 8 |
This is the first edition of the tournament as part of the WTA Tour. Isabel Cueto won the inaugural title by defeating Barbara Paulus 6–2, 6–3 in the final. [1]
Barbara Paulus (final) Isabel Cueto (champion)
Cathy Caverzasio (quarterfinals) Laura Lapi (first round)
Angeliki Kanellopoulou (first round)
Petra Langrová (first round) Florencia Labat (first round)| Semifinals | Final | ||||||||||||
| 1 | Barbara Paulus | 6 | 2 | 6 | |||||||||
| Q | Francesca Romano | 2 | 6 | 1 | |||||||||
| 1 | Barbara Paulus | 2 | 3 | ||||||||||
| 2 | Isabel Cueto | 6 | 6 | ||||||||||
| Beate Reinstadler | 1 | 1 | |||||||||||
| 2 | Isabel Cueto | 6 | 6 | ||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 1 | B Paulus | 77 | 7 | ||||||||||||||||||||||||
 M Pierce | 61 | 5 | 1 | B Paulus | 3 | 6 | 6 | ||||||||||||||||||||
| WC | S Farina | 6 | 6 | WC | S Farina | 6 | 4 | 2 | |||||||||||||||||||
| B Romanò | 3 | 1 | 1 | B Paulus | 6 | 6 | |||||||||||||||||||||
 E Zardo | 77 | 3 | 6 | E Zardo | 3 | 4 | |||||||||||||||||||||
| Q | H Kadzidroga | 65 | 6 | 2 | E Zardo | 6 | 6 | ||||||||||||||||||||
| C Cohen | 710 | 6 | C Cohen | 3 | 3 | ||||||||||||||||||||||
| 7 | P Langrová | 68 | 4 | 1 | B Paulus | 6 | 2 | 6 | |||||||||||||||||||
| 4 | L Lapi | 4 | 1 | Q | F Romano | 2 | 6 | 1 | |||||||||||||||||||
| K Piccolini | 6 | 6 | K Piccolini | 6 | 6 | ||||||||||||||||||||||
 S Goleš | 6 | S Goleš | 2 | 1 | |||||||||||||||||||||||
| M Maruska | 4 | r | K Piccolini | 6 | 4 | 4 | |||||||||||||||||||||
| N Baudone | 6 | 6 | Q | F Romano | 0 | 6 | 6 | ||||||||||||||||||||
| I Budařová | 3 | 3 | N Baudone | 6 | 2 | 3 | |||||||||||||||||||||
| Q |  R Bielsa | 4 | 5 | Q | F Romano | 1 | 6 | 6 | |||||||||||||||||||
| Q | F Romano | 6 | 7 | ||||||||||||||||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 5 | A Kanellopoulou | 4 | 2 | ||||||||||||||||||||||||
| F Bonsignori | 6 | 6 | F Bonsignori | 1 | 6 | 3 | |||||||||||||||||||||
| B Reinstadler | 3 | 6 | 77 | B Reinstadler | 6 | 2 | 6 | ||||||||||||||||||||
 K Kschwendt | 6 | 4 | 62 | B Reinstadler | 6 | 4 | 77 | ||||||||||||||||||||
| Q | C Nozzoli | 67 | 1 | 3 | C Caverzasio | 3 | 6 | 64 | |||||||||||||||||||
 C Toleafoa | 79 | 6 | C Toleafoa | 2 | 3 | ||||||||||||||||||||||
| J Pospíšilová | 5 | 0 | 3 | C Caverzasio | 6 | 6 | |||||||||||||||||||||
| 3 | C Caverzasio | 7 | 6 | B Reinstadler | 1 | 1 | |||||||||||||||||||||
| 8 | F Labat | 4 | 1 | 2 | I Cueto | 6 | 6 | ||||||||||||||||||||
| L Garrone | 6 | 6 | L Garrone | 3 | 4 | ||||||||||||||||||||||
| S La Fratta | 3 | 0 | M Laval | 6 | 6 | ||||||||||||||||||||||
| M Laval | 6 | 6 | M Laval | 4 | 1 | ||||||||||||||||||||||
| Q |  P Kamstra | 77 | 4 | 3 | 2 | I Cueto | 6 | 6 | |||||||||||||||||||
| L Lásková | 64 | 6 | 6 | L Lásková | 4 | 77 | 1 | ||||||||||||||||||||
| P Ritter | 1 | 65 | 2 | I Cueto | 6 | 63 | 6 | ||||||||||||||||||||
| 2 | I Cueto | 6 | 77 | ||||||||||||||||||||||||
Anke Huber was the defending champion but did not compete that year.
Steffi Graf was the defending champion and won in the final 6–3, 6–2 against Helena Suková.
Steffi Graf was the defending champion and won the final on a walkover against Jana Novotná.
Judith Wiesner won in the final 6–3, 6–7, 6–1 against Barbara Paulus.
Isabel Cueto won in the final 7–6, 6–2 against Sandra Cecchini.
Isabel Cueto was the defending champion but lost in the quarterfinals to Maria Strandlund.
Gabriela Sabatini was the defending champion and won in the final 6–0, 6–2 against Isabel Cueto.
Lori McNeil and Mercedes Paz were the defending champions but only Paz competed that year with Gabriela Sabatini.
Vicki Nelson-Dunbar was the defending champion but lost in the first round to Olga Tsarbopoulou.
Judith Wiesner won in the final 6–1, 6–2 against Sylvia Hanika.
Steffi Graf was the defending champion and won in the final 6–4, 6–2 against Katerina Maleeva.
Katerina Maleeva was the defending champion but did not compete that year.
Sabine Appelmans was the defending champion, but did not compete this year.
Isabel Cueto was the defending champion, but lost in the quarterfinals to Federica Bonsignori.
Isabel Cueto was the defending champion, but lost in the first round to Federica Bonsignori.
Barbara Paulus was the defending champion, but did not compete this year.
Steffi Graf won the tournament for the fifth time in a row after defeating Monica Seles 7–5, 6–7(4–7), 6–3 in the final.
Sylvia Hanika was the defending champion, but did not compete this year.
Isabel Cueto and Arantxa Sánchez Vicario were the defending champions, but Sánchez Vicario did not compete this year. Cueto teamed up with Bettina Fulco and lost in the first round to Mercedes Paz and Patricia Tarabini.
Sandra Cecchini was the defending champion, but lost in the semifinals to Patricia Tarabini.