| Singles | |
|---|---|
| 1998 U.S. Pro Tennis Championships | |
| Champions |  Michael Chang [1] |
| Runners-up |  Paul Haarhuis |
| Score | 6–3, 6–4 |
| Draw | 32 |
| Seeds | 8 |
The 1998 U.S. Pro Tennis Championships was a men's tennis tournament played on Hard courts in Boston, United States that was part of the International Series of the 1998 ATP Tour. It was the seventieth edition of the tournament and was held from 24 to 30 August 1998.
Champion seeds are indicated in bold text while text in italics indicates the round in which those seeds were eliminated.
Jonas Björkman (quarterfinals)
Karol Kučera (first round)
Cédric Pioline (semifinals) Michael Chang (champion)
Thomas Muster (first round) Fabrice Santoro (first round)
Andrea Gaudenzi (first round)| Semifinals | Final [1] | ||||||||||||
| Sébastien Grosjean | 5 | 6 | 6 | ||||||||||
| 4 | Michael Chang | 7 | 4 | 3 | |||||||||
| 4 | Michael Chang | 6 | 6 | ||||||||||
| Paul Haarhuis | 3 | 4 | |||||||||||
| 3 | Cédric Pioline | 5 | 6 | 3 | |||||||||
| Paul Haarhuis | 7 | 4 | 6 | ||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 1 | J Björkman | 6 | 6 | ||||||||||||||||||||||||
| A Clément | 2 | 3 | 1 | J Björkman | 6 | 7 | |||||||||||||||||||||
 G Blanco | 3 | 6 | 6 | G Blanco | 2 | 65 | |||||||||||||||||||||
 H Gumy | 6 | 1 | 4 | 1 | J Björkman | 67 | 1 | ||||||||||||||||||||
| S Grosjean | 6 | 6 | S Grosjean | 7 | 6 | ||||||||||||||||||||||
| J van Lottum | 2 | 0 | S Grosjean | 6 | 7 | ||||||||||||||||||||||
 X Malisse | 6 | 6 | X Malisse | 4 | 5 | ||||||||||||||||||||||
| S Campbell | 3 | 1 | S Grosjean | 5 | 6 | 6 | |||||||||||||||||||||
| 4 | M Chang | 7 | 6 | 4 | M Chang | 7 | 4 | 3 | |||||||||||||||||||
 A Pavel | 5 | 2 | 4 | M Chang | 4 | 6 | 6 | ||||||||||||||||||||
 K Carlsen | 3 | 6 | 6 | K Carlsen | 6 | 3 | 4 | ||||||||||||||||||||
| J Golmard | 6 | 3 | 4 | 4 | M Chang | 6 | 2 | 6 | |||||||||||||||||||
| L Roux | 6 | 6 | G Pozzi | 4 | 6 | 1 | |||||||||||||||||||||
 R Delgado | 4 | 2 | L Roux | 7 | 2 | 63 | |||||||||||||||||||||
| G Pozzi | 6 | 6 | G Pozzi | 5 | 6 | 7 | |||||||||||||||||||||
| 6 | F Santoro | 2 | 2 | ||||||||||||||||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 5 | T Muster | 6 | 6 | ||||||||||||||||||||||||
 M Filippini | 0 | 2 | 5 | T Muster | 6 | 6 | |||||||||||||||||||||
 N Lapentti | 68 | 6 | 7 | N Lapentti | 2 | 4 | |||||||||||||||||||||
| C Costa | 7 | 4 | 5 | 5 | T Muster | 5 | 3 | ||||||||||||||||||||
 A Ilie | 6 | 6 | 3 | C Pioline | 7 | 6 | |||||||||||||||||||||
| F Squillari | 4 | 2 | A Ilie | 4 | 2 | ||||||||||||||||||||||
| 3 | C Pioline | 6 | 6 | 3 | C Pioline | 6 | 6 | ||||||||||||||||||||
| A Voinea | 4 | 0 | 3 | C Pioline | 5 | 6 | 3 | ||||||||||||||||||||
 J Novák | 4 | 6 | 6 | P Haarhuis | 7 | 4 | 6 | ||||||||||||||||||||
| 7 | A Gaudenzi | 6 | 1 | 1 | J Novák | 1 | 6 | 5 | |||||||||||||||||||
| P Haarhuis | 6 | 6 | P Haarhuis | 6 | 4 | 7 | |||||||||||||||||||||
| L Arnold | 1 | 3 | P Haarhuis | 0 | 6 | 6 | |||||||||||||||||||||
| S Schalken | 7 | 7 | S Schalken | 6 | 4 | 3 | |||||||||||||||||||||
| D Sanguinetti | 63 | 63 | S Schalken | 6 | 6 | ||||||||||||||||||||||
| J Tarango | 6 | 6 | J Tarango | 1 | 1 | ||||||||||||||||||||||
| 2 | K Kučera | 2 | 3 | ||||||||||||||||||||||||
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