The 1998 Lipton Championships was a tennis tournament played on outdoor hard courts. It was the 14th edition of the Miami Masters and was part of the Super 9 of the 1998 ATP Tour and of Tier I of the 1998 WTA Tour. Both the men's and the women's events took place at the Tennis Center at Crandon Park in Key Biscayne, Florida in the United States from March 16 through March 29, 1998.
| 1998 Lipton Championships | |
|---|---|
| Date | March 16–29 |
| Edition | 14th |
| Surface | Hard / outdoor |
| Location | Key Biscayne, Florida, U.S. |
| Venue | Tennis Center at Crandon Park |
| Champions | |
| Men's singles | |
 Marcelo Ríos | |
| Women's singles | |
 Venus Williams | |
| Men's doubles | |
 Ellis Ferreira / Rick Leach | |
| Women's doubles | |
 Martina Hingis /  Jana Novotná | |
Finals
Men's singles
Marcelo Ríos defeated Andre Agassi 7–5, 6–3, 6–4
- It was Ríos' 3rd title of the year and the 9th of his career. It was his 2nd Super 9 title of the year and his 3rd overall.
Women's singles
Venus Williams defeated 
Anna Kournikova 2–6, 6–4, 6–1
- It was Williams' 4th title of the year and the 4th of her career. It was her 1st Tier I title of the year and her 1st overall.
Men's doubles
Ellis Ferreira / Rick Leach defeated Alex O'Brien / Jonathan Stark 6–2, 6–4
- It was Ferreira's 1st title of the year and the 9th of his career. It was Leach's 1st title of the year and the 35th of his career.
Women's doubles
Martina Hingis / Jana Novotná defeated 
Arantxa Sánchez-Vicario / 
Natasha Zvereva 6–2, 3–6, 6–3
- It was Hingis' 6th title of the year and the 31st of her career. It was Novotná's 2nd title of the year and the 95th of her career.