| Tournament details | |
|---|---|
| Country | United States |
| Final positions | |
| Champions | Chicago Fire (1st title) |
| Runner-up | Columbus Crew |
| Tournament statistics | |
| Top goal scorer(s) | Jason Acres (4 goals) |
The 1998 U.S. Open Cup ran from June through October, 1998, open to all soccer teams in the United States.
The first-year Major League Soccer club Chicago Fire won the Cup with a 2–1 overtime victory over the Columbus Crew at Soldier Field in Chicago, Illinois.
In the early rounds of the tournament, only one MLS team lost to a minor-league side, when the A-League's Nashville Metros beat the Kansas City Wizards 3–1.