Marcelo Ríos defeated Andre Agassi in the final, 7–5, 6–3, 6–4 to win the men's singles tennis title at the 1998 Miami Open. With the win, he completed the Sunshine Double and overtook Pete Sampras' No. 1 ranking; Ríos to this day remains the only ATP world No. 1 without having won a Grand Slam title.
Thomas Muster was the reigning champion, but did not participate this year.
Seeds All thirty-two 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
External links Main draw