See main article: 1998 Heineken Open. First-seeded Marcelo Ríos defeated Richard Fromberg 4–6, 6–4, 7–6(7–3) to win the 1998 Heineken Open singles competition. Jonas Björkman was the champion but did not defend his title.
A champion seed is indicated in bold text while text in italics indicates the round in which that seed was eliminated.