# 2005 Croatia Open Umag – Singles

Guillermo Cañas was the defending champion, but did not participate.
Guillermo Coria won the title, defeating Carlos Moyá 6–2, 4–6, 6–2 in the final.

## Seeds

* Rafael Nadal (withdrew due to knee tendinitis)
* Guillermo Coria (champion)
* Tommy Robredo (quarterfinals)
* David Ferrer (quarterfinals)
* Jiří Novák (semifinals)
* Carlos Moyá (final)
* Juan Carlos Ferrero (quarterfinals)
* Filippo Volandri (semifinals)
* Alberto Martín (first 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 | Semifinals | Final | Final | Final | Final | Final |
| 5 | Jiří Novák | 4 | 4 | | | | | | |
| 6 | Carlos Moyá | 6 | 6 | | | | | | |
| 6 | Carlos Moyá | 6 | 6 | | 6 | Carlos Moyá | 2 | 6 | 2 |
| | | | | | 2 | Guillermo Coria | 6 | 4 | 6 |
| 8 | Filippo Volandri | 6 | 3 | 2 | 2 | Guillermo Coria | 6 | 4 | 6 |
| 2 | Guillermo Coria | 4 | 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 |
| 9 | A Martín | 5 | 3 | | | | | | | | | | | | | | | |
| | L Dlouhý | 7 | 6 | | | L Dlouhý | 6 | 6 | | | | | | | | | | |
| | F Aldi | 3 | 3 | | Q | I Bozoljac | 3 | 2 | | | | | | | | | | |
| Q | I Bozoljac | 6 | 6 | | | | | | | | L Dlouhý | 0 | 3 | | | | | |
| | J Vaněk | 1 | 0 | | | | | | | 5 | J Novák | 6 | 6 | | | | | |
| Q | A Portas | 6 | 6 | | Q | A Portas | 0 | 6 | 5 | | | | | | | | | |
| | A Montañés | 3 | 3 | | 5 | J Novák | 6 | 4 | 7 | | | | | | | | | |
| 5 | J Novák | 6 | 6 | | | | | | | | | | | | 5 | J Novák | 4 | 4 |
| 4 | D Ferrer | 6 | 3 | 6 | | | | | | | | | | | 6 | C Moyá | 6 | 6 |
| | P Starace | 3 | 6 | 2 | 4 | D Ferrer | 6 | 6 | | | | | | | | | | |
| | F Vicente | 6 | 6 | | | F Vicente | 2 | 3 | | | | | | | | | | |
| Q | V Ioniță | 2 | 2 | | | | | | | 4 | D Ferrer | 4 | 6 | 3 | | | | |
| | K Vliegen | 7 | 6 | | | | | | | 6 | C Moyá | 6 | 0 | 6 | | | | |
| WC | M Čilić | 5 | 2 | | | K Vliegen | 3 | 1 | | | | | | | | | | |
| | B Ulihrach | 2 | 0$^r$ | | 6 | C Moyá | 6 | 6 | | | | | | | | | | |
| 6 | C Moyá | 6 | 0 | | | | | | | | | | | | | | | |

### 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 | Semifinals |
| 8 | F Volandri | 6 | 6 | | | | | | | | | | | | | | | | |
| WC | S Tuksar | 2 | 1 | | 8 | F Volandri | 6 | 6 | | | | | | | | | | | |
| | Ó Hernández | 2 | 2 | | | G García-López | 1 | 1 | | | | | | | | | | | |
| | G García-López | 6 | 6 | | | | | | | 8 | F Volandri | 3 | 6 | 6 | | | | | |
| | D Norman | 0 | 0 | | | | | | | 3 | T Robredo | 6 | 3 | 3 | | | | | |
| | J Tipsarević | 6 | 6 | | | J Tipsarević | 3 | 1 | | | | | | | | | | | |
| WC | G Kuerten | 4 | 4 | | 3 | T Robredo | 6 | 6 | | | | | | | | | | | |
| 3 | T Robredo | 6 | 6 | | | | | | | | | | | | 8 | F Volandri | 6 | 3 | 2 |
| 7 | JC Ferrero | 6 | 3 | | | | | | | | | | | | 2 | G Coria | 4 | 6 | 6 |
| | J Nieminen | 0 | 1$^r$ | | 7 | JC Ferrero | 6 | 6 | | | | | | | | | | | |
| | Á Calatrava | 1 | 4 | | | N Djokovic | 4 | 2 | | | | | | | | | | | |
| | N Djokovic | 6 | 6 | | | | | | | 7 | JC Ferrero | 3 | 0 | | | | | | |
| LL | A Mackin | 2 | 1 | | | | | | | 2 | G Coria | 6 | 6 | | | | | | |
| | F Mantilla | 6 | 6 | | | F Mantilla | 6 | 2 | 1 | | | | | | | | | | |
| Q | Ž Krajan | 7 | 3 | 4 | 2 | G Coria | 3 | 6 | 6 | | | | | | | | | | |
| 2 | G Coria | 5 | 6 | 6 | | | | | | | | | | | | | | | |