Monica Seles defeated Judith Wiesner in the final, 6–1, 6–2 to win the women's singles tennis title at the 1990 Miami Open.
Gabriela Sabatini was the defending champion, but lost in the quarterfinals to Conchita Martínez.
Seeds All seeds received a bye to the second round.
Draw
Finals
Top half
Section 1
Section 2
Section 3
Section 4
Bottom half
Section 5
Section 6
Section 7
Section 8
References
External links ITF tournament edition details