2018 Miami Open – Women's Singles
was the defending champion, but lost in the fourth round to Venus Williams.
Sloane Stephens won the title, defeating Jeļena Ostapenko in the final, 7–6, 6–1. It was Stephens' sixth career singles title, first Premier Mandatory title, and first title since winning the US Open back in September. By virtue of her victory, Stephens also made her debut in the Top 10, at No. 9.
Danielle Collins became the first qualifier in Miami Open history to reach the semifinals. She defeated Venus Williams in the quarterfinals.Seeds
All seeds received a bye into the second round.Draw
Finals
Top half
Section 2
Section 3
Section 4
Section 5
Section 6
Section 7
Section 8
Qualifying
Seeds
Qualifiers
Qualifying draw
First qualifier
Second qualifier
Third qualifier
Fourth qualifier
Fifth qualifier
Sixth qualifier
Seventh qualifier
Eighth qualifier
Ninth qualifier
Eleventh qualifier
Twelfth qualifier