1998 Sybase Open – Singles
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Pete Sampras was the two-time defending champion, but lost in the final to Andre Agassi, 2–6, 4–6.
Seeds
- United States Pete Sampras (final)
- United States Michael Chang (semifinals)
- Brazil Gustavo Kuerten (second round)
- Australia Mark Philippoussis (first round)
- Australia Todd Woodbridge (first round)
- Australia Richard Fromberg (first round)
- Germany Tommy Haas (quarterfinals)
- Australia Mark Woodforde (quarterfinals)
Draw
Key
- Q = Qualifier
- WC = Wild card
- LL = Lucky loser
- Alt = Alternate
- ITF = ITF entry
- PR = Protected ranking
- SR = Special ranking
- SE = Special exempt
- JE = Junior exempt
- JR = Junior Accelerator Programme entrant
- CO = College Accelerator Programme entrant
- NG = Next Gen Accelerator Program entrant
- w/o = Walkover
- r = Retired
- d = Defaulted
Finals
| Semifinals | Final | ||||||||||||
| 1 | United States Pete Sampras | 6 | 2 | 6 | |||||||||
| Q | Netherlands John van Lottum | 3 | 6 | 2 | |||||||||
| 1 | United States Pete Sampras | 2 | 4 | ||||||||||
| WC | United States Andre Agassi | 6 | 6 | ||||||||||
| WC | United States Andre Agassi | 6 | 77 | ||||||||||
| 2 | United States Michael Chang | 4 | 64 |
Top half
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 1 | United States P Sampras | 6 | 6 | ||||||||||||||||||||||||
| United States J Stark | 3 | 4 | 1 | United States P Sampras | 6 | 77 | |||||||||||||||||||||
| Italy A Gaudenzi | 3 | 1 | Spain J Burillo | 3 | 62 | ||||||||||||||||||||||
| Spain J Burillo | 6 | 6 | 1 | United States P Sampras | 6 | 6 | |||||||||||||||||||||
| WC | United States M Washington | 7 | 6 | 8 | Australia M Woodforde | 0 | 2 | ||||||||||||||||||||
| Paraguay R Delgado | 5 | 2 | WC | United States M Washington | 5 | 5 | |||||||||||||||||||||
| Zimbabwe W Black | 78 | 2 | 4 | 8 | Australia M Woodforde | 7 | 7 | ||||||||||||||||||||
| 8 | Australia M Woodforde | 66 | 6 | 6 | 1 | United States P Sampras | 6 | 2 | 6 | ||||||||||||||||||
| 4/WC | Australia M Philippoussis | 4 | 3 | Q | Netherlands J van Lottum | 3 | 6 | 2 | |||||||||||||||||||
| United States V Spadea | 6 | 6 | United States V Spadea | 5 | 77 | 2 | |||||||||||||||||||||
| Q | Netherlands J van Lottum | 6 | 4 | 6 | Q | Netherlands J van Lottum | 7 | 62 | 6 | ||||||||||||||||||
| United States A O'Brien | 3 | 6 | 2 | Q | Netherlands J van Lottum | 2 | 6 | 710 | |||||||||||||||||||
| Spain E Benfele Álvarez | 61 | 5 | United States T Martin | 6 | 4 | 68 | |||||||||||||||||||||
| Q | Brazil J Oncins | 77 | 7 | Q | Brazil J Oncins | 3 | 63 | ||||||||||||||||||||
| United States T Martin | 6 | 7 | United States T Martin | 6 | 77 | ||||||||||||||||||||||
| 5 | Australia T Woodbridge | 4 | 5 |
Bottom half
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 6 | Australia R Fromberg | 77 | 2 | 4 | |||||||||||||||||||||||
| Sweden T Nydahl | 65 | 6 | 6 | Sweden T Nydahl | 4 | 61 | |||||||||||||||||||||
| Armenia S Sargsian | 3 | 6 | 4 | Q | United States J-M Gambill | 6 | 77 | ||||||||||||||||||||
| Q | United States J-M Gambill | 6 | 1 | 6 | Q | United States J-M Gambill | 5 | 67 | |||||||||||||||||||
| WC | United States A Agassi | 6 | 6 | WC | United States A Agassi | 7 | 79 | ||||||||||||||||||||
| Spain A Martín | 2 | 2 | WC | United States A Agassi | 6 | 6 | |||||||||||||||||||||
| United States J Gimelstob | 65 | 6 | 1 | 3 | Brazil G Kuerten | 3 | 1 | ||||||||||||||||||||
| 3 | Brazil G Kuerten | 77 | 4 | 6 | WC | United States A Agassi | 6 | 77 | |||||||||||||||||||
| 7 | Germany T Haas | 6 | 6 | 2 | United States M Chang | 4 | 64 | ||||||||||||||||||||
| Spain JA Viloca-Puig | 1 | 4 | 7 | Germany T Haas | 6 | 6 | |||||||||||||||||||||
| United States R Reneberg | 4 | 2 | South Africa G Stafford | 2 | 3 | ||||||||||||||||||||||
| South Africa G Stafford | 6 | 6 | 7 | Germany T Haas | 3 | 77 | 4 | ||||||||||||||||||||
| Q | Switzerland G Bastl | 6 | 2 | 6 | 2 | United States M Chang | 6 | 63 | 6 | ||||||||||||||||||
| Brazil F Meligeni | 1 | 6 | 3 | Q | Switzerland G Bastl | 5 | 3 | ||||||||||||||||||||
| Germany M Craca | 2 | 4 | 2 | United States M Chang | 7 | 6 | |||||||||||||||||||||
| 2 | United States M Chang | 6 | 6 |