2018 Miami Open – Women's Singles

Johanna Konta 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(7–5), 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.

2018 Miami Open – Women's Singles

Johanna Konta 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(7–5), 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.