1998 Japan Open Tennis Championships – Men's singles

The 1998 Japan Open Tennis Championships was a tennis tournament played on outdoor hard courts at the Ariake Coliseum in Tokyo in Japan that was part of the International Series Gold of the 1998 ATP Tour and of Tier III of the 1998 WTA Tour. The tournament was held from April 13 through April 19, 1998.

Seeds
Champion seeds are indicated in bold text while text in italics indicates the round in which those seeds were eliminated. • #🇦🇺 Patrick Rafter (second round)

• #🇺🇸 Michael Chang (third round)

• #🇺🇸 Jan-Michael Gambill (quarterfinals)

• #🇸🇪 Thomas Johansson (second round)

• #🇺🇸 Vince Spadea (second round)

• #🇨🇿 Martin Damm (second round)

• #🇮🇹 Gianluca Pozzi (second round)

• #🇩🇰 Kenneth Carlsen (second round)

• #🇺🇸 Steve Campbell (second round)

• #🇿🇼 Byron Black (final)

• #🇺🇸 Jan-Michael Gambill (semifinals)

• #🇨🇿 Byron Black (semifinals)

• #🇸🇪 Mikael Tillström (third round)

• #🇫🇷 Jérôme Golmard (third round)

• #🇫🇷 Arnaud Clément (first round)

• #🇷🇴 Andrei Pavel (champions)