# 1998 Croatia Open Umag – Singles

The 1998 Croatia Open Umag was a tennis tournament played on outdoor clay courts in Umag, Croatia that was part of the International Series of the 1998 ATP Tour. The tournament was held from July 27 through August 2, 1998.

## Seeds

Champion seeds are indicated in bold text while text in italics indicates the round in which those seeds were eliminated.
* Carlos Moyá (first round)
* Félix Mantilla (quarterfinals)
* Karol Kučera (quarterfinals)
* Gustavo Kuerten (quarterfinals)
* Dominik Hrbatý (first round)
* Magnus Norman (final)
* Bohdan Ulihrach (champion)
* Davide Sanguinetti (second round)

## Draw
### Key

* Q = Qualifier
* WC = Wild card
* LL = Lucky loser
* Alt = Alternate
* SE = Special exempt
* PR = Protected ranking
* ITF = ITF entry
* JE = Junior exempt
* w/o = Walkover
* r = Retired
* d = Defaulted
* SR = Special ranking

### Finals

| Semifinals | Semifinals | Semifinals | Semifinals | Final | Final | Final | Final |
| | Juan Antonio Marín | 6$^3$ | 3 | | | | |
| 6 | Magnus Norman | 7 | 6 | | | | |
| 6 | Magnus Norman | 7 | 6 | 6 | Magnus Norman | 3 | 6$^0$ |
| | | | | 7 | Bohdan Ulihrach | 6 | 7 |
| | Mariano Puerta | 3 | 3 | 7 | Bohdan Ulihrach | 6 | 7 |
| 7 | Bohdan Ulihrach | 6 | 6 | | | | |

### Top half

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 1 | C Moyá | 5 | 6 | 1 | | | | | | | | | | | | | | |
| | P Haarhuis | 7 | 4 | 6 | | P Haarhuis | w/o | | | | | | | | | | | |
| | J Knippschild | 3 | 1 | | | J Burillo | | | | | | | | | | | | |
| | J Burillo | 6 | 6 | | | | | | | | P Haarhuis | 2 | 6$^2$ | | | | | |
| | JA Marín | 4 | 6 | 6 | | | | | | | JA Marín | 6 | 7 | | | | | |
| | R Furlan | 6 | 3 | 4 | | JA Marín | 7 | 3 | 6 | | | | | | | | | |
| | O Stanoytchev | 4 | 6 | 4 | 8 | D Sanguinetti | '6$^4$ | 6 | 3 | | | | | | | | | |
| 8 | D Sanguinetti | 6 | 3 | 6 | | | | | | | | | | | | JA Marín | 6$^3$ | 3 |
| 3 | K Kučera | 6 | 6 | | | | | | | | | | | | 6 | M Norman | 7 | 6 |
| | S Bruguera | 4 | 0 | | 3 | K Kučera | 7 | 6 | | | | | | | | | | |
| Q | B Urh | 6 | 6 | | | B Urh | 5 | 2 | | | | | | | | | | |
| Q | L Němeček | 3 | 1 | | | | | | | 3 | K Kučera | 6 | 4 | 4 | | | | |
| Q | S Cobolli | 5 | 6 | 6 | | | | | | 6 | M Norman | 1 | 6 | 6 | | | | |
| Q | T Čatár | 7 | 4 | 3 | | S Cobolli | 6$^5$ | 6 | 2 | | | | | | | | | |
| WC | I Ljubičić | 6$^4$ | 6 | 3 | 6 | M Norman | 7 | 3 | 6 | | | | | | | | | |
| 6/WC | M Norman | 7 | 4 | 6 | | | | | | | | | | | | | | |

### Bottom half

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 5 | D Hrbatý | 3 | 6 | 4 | | | | | | | | | | | | | | |
| | M Puerta | 6 | 2 | 6 | | M Puerta | 6 | 4 | 6 | | | | | | | | | |
| | M Martelli | 4 | 4 | | | J Sánchez | 4 | 6 | 4 | | | | | | | | | |
| | J Sánchez | 6 | 6 | | | | | | | | M Puerta | 6 | 1 | 7 | | | | |
| | J Novák | 6 | 1 | 6 | | | | | | 4 | G Kuerten | 4 | 6 | 6$^5$ | | | | |
| | V Santopadre | 2 | 6 | 1 | | J Novák | 6 | 6$^1$ | 3 | | | | | | | | | |
| | M-K Goellner | 0 | 6$^3$ | | 4 | G Kuerten | 4 | 7 | 6 | | | | | | | | | |
| 4 | G Kuerten | 6 | 7 | | | | | | | | | | | | | M Puerta | 3 | 3 |
| 7 | B Ulihrach | 7 | 6 | | | | | | | | | | | | 7 | B Ulihrach | 6 | 6 |
| | D Pescariu | 6$^5$ | 4 | | 7 | B Ulihrach | 7 | 3 | 6 | | | | | | | | | |
| | J Díaz | 6 | 6 | | | J Díaz | 6$^8$ | 6 | 4 | | | | | | | | | |
| WC | E Rasberger | 3 | 3 | | | | | | | 7 | B Ulihrach | 6 | 3 | 7 | | | | |
| | M Carlsson | 6 | 5 | 3 | | | | | | 2 | F Mantilla | 3 | 6 | 6$^2$ | | | | |
| | A Voinea | 1 | 7 | 6 | | A Voinea | 3 | 0 | | | | | | | | | | |
| | L Burgsmüller | 3 | 3 | | 2 | F Mantilla | 6 | 6 | | | | | | | | | | |
| 2 | F Mantilla | 6 | 6 | | | | | | | | | | | | | | | |