| Doubles | |
|---|---|
| 1998 Open 13 | |
| Champions |  Donald Johnson Francisco Montana |
| Runners-up | Mark Keil T.J. Middleton |
| Final score | 6–4, 3–6, 6–3 |
Thomas Enqvist and Magnus Larsson were the defending champions, but did not participate this year.
Donald Johnson and Francisco Montana won the title, defeating Mark Keil and T.J. Middleton 6–4, 3–6, 6–3 in the final.
Yevgeny Kafelnikov / 
Daniel Vacek (semifinals) Donald Johnson / Francisco Montana (champions)
Tomás Carbonell / Francisco Roig (quarterfinals)
Tom Nijssen / Jeff Tarango (first round)| First round | Quarterfinals | Semifinals | Final | ||||||||||||||||||||||||
| 1 | Y Kafelnikov D Vacek | 6 | 6 | ||||||||||||||||||||||||
 M Barnard B Haygarth | 3 | 3 | 1 | Y Kafelnikov D Vacek | 6 | 5 | 7 | ||||||||||||||||||||
 C Brandi F Messori | 2 | 7 | 4 |  D Sapsford C Wilkinson | 3 | 7 | 6 | ||||||||||||||||||||
| D Sapsford C Wilkinson | 6 | 6 | 6 | 1 | Y Kafelnikov D Vacek | 5 | 3 | ||||||||||||||||||||
| 3 | T Carbonell F Roig | 6 | 7 | 6 | M Keil TJ Middleton | 7 | 6 | ||||||||||||||||||||
 P Nyborg M Tillström | 7 | 6 | 4 | 3 | T Carbonell F Roig | 4 | 3 | ||||||||||||||||||||
| M Keil TJ Middleton | 6 | 7 | M Keil TJ Middleton | 6 | 6 | ||||||||||||||||||||||
| Q |  J-F Bachelot J-M Pequery | 3 | 6 | M Keil TJ Middleton | 4 | 6 | 3 | ||||||||||||||||||||
 P Kilderry A Martín | 3 | 6 | 6 | 2 | D Johnson F Montana | 6 | 3 | 6 | |||||||||||||||||||
| WC | A Clément S Grosjean | 6 | 3 | 0 | P Kilderry A Martín | 2 | 4 | ||||||||||||||||||||
J Alonso  G Kuerten | 6 | 6 | J Alonso G Kuerten | 6 | 6 | ||||||||||||||||||||||
| 4 | T Nijssen J Tarango | 3 | 4 | J Alonso G Kuerten | 4 | 4 | |||||||||||||||||||||
| D Adams J-P Fleurian | 6 | 6 | 2 | D Johnson F Montana | 6 | 6 | |||||||||||||||||||||
 K Alami P Rosner | 3 | 4 | D Adams J-P Fleurian | 6 | 3 | 4 | |||||||||||||||||||||
| WC | A Boetsch  F Dewulf | 4 | 4 | 2 | D Johnson F Montana | 3 | 6 | 6 | |||||||||||||||||||
| 2 | D Johnson F Montana | 6 | 6 | ||||||||||||||||||||||||
Yevgeny Kafelnikov and Daniel Vacek were the defending champions but did not compete that year.
Ellis Ferreira and Patrick Galbraith were the defending champions but only Ferreira competed that year with Rick Leach.
Todd Woodbridge and Mark Woodforde were the defending champions and won in the final 6–3, 6–3 against Ivan Baron and Brett Hansen-Dent.
Francisco Montana and Greg Van Emburgh were the defending champions but they competed with different partners that year, Montana with Donald Johnson and Van Emburgh with Shelby Cannon.
Tomás Carbonell and Francisco Roig were the defending champions but were defeated in the quarterfinals by Pablo Albano and Lucas Arnold.
Jonas Björkman and John-Laffnie de Jager were the defending champions but did not compete that year.
Donald Johnson and Francisco Montana were the defending champions, but did not participate together this year. Johnson partnered Tomás Carbonell, successfully defending his title. Montana partnered Chris Haggard, losing in the semifinals.
Gustavo Kuerten and Fernando Meligeni were the defending champions. Kuerten did not participate this year. Meligeni partnered Filippo Messori, losing in the quarterfinals.
Tomás Carbonell and Francisco Roig were the defending champions, but did not participate this year.
Donald Johnson and Francisco Montana were the defending champions, but lost in the semifinals this year.
Mark Petchey and Danny Sapsford were the defending champions, but did not partner together this year. Petchey partnered Sargis Sargsian, losing in the first round. Sapsford partnered Chris Wilkinson, losing in the final.
Donald Johnson and Francisco Montana were the defending champions, but lost in the second round to Tomás Carbonell and Francisco Roig.
Luis Lobo and Javier Sánchez were the defending champions, but lost in the second round to Tomás Carbonell and Francisco Roig.
Todd Woodbridge and Mark Woodforde were the defending champion, but lost in the quarterfinals to Saša Hiršzon and Goran Ivanišević.
Mark Knowles and Daniel Nestor were the defending champions, but Knowles did not compete this year. Nestor teamed up with Cyril Suk and lost in quarterfinals to Olivier Delaître and Fabrice Santoro.
Ellis Ferreira and Jan Siemerink were the defending champions, but competed this year with different partners. Ferreira teamed up with Patrick Galbraith and lost in quarterfinals to tournament winners Donald Johnson and Francisco Montana, while Siemerink teamed up with Menno Oosting and lost in first round to Pablo Albano and Àlex Corretja.
Libor Pimek and Byron Talbot were the defending champions, but lost in the second round to tournament winners Gustavo Kuerten and Fernando Meligeni.
Donald Johnson and Francisco Montana were the defending champions, but decided to compete in Stuttgart at the same week
Francisco Montana and Bryan Shelton were the defending champions, but lost in the quarterfinals to Javier Frana and Leonardo Lavalle.
Donald Johnson and Francisco Montana were the defending champions, but Johnson chose to compete at Basel in the same week. Montana teamed up with Nebojša Đorđević and lost in the first round to Pablo Albano and Guillermo Cañas.