# 2006 Croatia Open Umag – Singles

Stan Wawrinka won his first ATP title, after Novak Djokovic retired in the final while leading 3–1 in the first-set tiebreak.
Guillermo Coria was the defending champion, but lost in the first round to Robin Vik.

## Seeds

* David Ferrer (withdrew)
* Juan Carlos Ferrero (first round)
* Guillermo Coria (first round)
* Novak Djokovic (final, retired due to breathing problems)
* Carlos Moyá (semifinals)
* Alberto Martín (first round)
* Julien Benneteau (first round)
* Filippo Volandri (semifinals)

## 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 |
| 5 | Carlos Moyá | 1 | 5 | | | | |
| 4 | Novak Djokovic | 6 | 7 | | | | |
| 4 | Novak Djokovic | 6 | 7 | | 4 | Novak Djokovic | 6$^{3r}$ |
| | | | | | | Stan Wawrinka | 6$^1$ |
| | Stan Wawrinka | 7 | 2 | 6 | | Stan Wawrinka | 6$^1$ |
| 8 | Filippo Volandri | 5 | 6 | 4 | | | |

### 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 |
| LL | S Galvani | 2 | 2 | | | | | | | | | | | | | | | |
| | C Berlocq | 6 | 6 | | | C Berlocq | 6 | 3 | 2 | | | | | | | | | |
| Q | JP Guzmán | 4 | 6 | 6 | Q | JP Guzmán | 3 | 6 | 6 | | | | | | | | | |
| | G García-López | 6 | 3 | 4 | | | | | | Q | JP Guzmán | 1 | 4 | | | | | |
| | A di Mauro | 5 | 6$^5$ | | | | | | | 5 | C Moyá | 6 | 6 | | | | | |
| | S Greul | 7 | 7$^7$ | | | S Greul | 2 | 1 | | | | | | | | | | |
| | J Novák | 4 | 7$^8$ | 6$^3$ | 5 | C Moyá | 6 | 6 | | | | | | | | | | |
| 5 | C Moyá | 6 | 6$^6$ | 7$^7$ | | | | | | | | | | | 5 | C Moyá | 1 | 5 |
| 4 | N Djokovic | 6 | 6 | | | | | | | | | | | | 4 | N Djokovic | 6 | 7 |
| WC | L Belić | 3 | 3 | | 4 | N Djokovic | 6 | 6 | | | | | | | | | | |
| Q | S Ianni | 6$^6$ | | | Q | S Ianni | 3 | 4 | | | | | | | | | | |
| | T Gabashvili | 6$^{4r}$ | | | | | | | | 4 | N Djokovic | 6 | 3 | 7 | | | | |
| | J Vaněk | 7 | 6 | | | | | | | | J Vaněk | 1 | 6 | 5 | | | | |
| Q | S Ventura | 5 | 4 | | | J Vaněk | 7$^7$ | 6 | | | | | | | | | | |
| | L Dlouhý | 2 | 6 | 6 | | L Dlouhý | 6$^4$ | 4 | | | | | | | | | | |
| 7 | J Benneteau | 6 | 3 | 2 | | | | | | | | | | | | | | |

### 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 |
| 6 | A Martín | 6$^3$ | 4 | | | | | | | | | | | | | | | | |
| | S Wawrinka | 7$^7$ | 6 | | | S Wawrinka | 6 | 2 | 6 | | | | | | | | | | |
| | E Korolev | 7$^7$ | 4 | 3 | WC | M Čilić | 4 | 6 | 4 | | | | | | | | | | |
| WC | M Čilić | 6$^5$ | 6 | 6 | | | | | | | S Wawrinka | 6 | 2 | 6 | | | | | |
| WC | JM del Potro | 6 | 6 | | | | | | | WC | JM del Potro | 1 | 6 | 4 | | | | | |
| | R Sluiter | 3 | 2 | | WC | JM del Potro | 2 | 6 | 6 | | | | | | | | | | |
| | R Vik | 6 | 6 | | | R Vik | 6 | 4 | 3 | | | | | | | | | | |
| 3 | G Coria | 2 | 3 | | | | | | | | | | | | | S Wawrinka | 7 | 2 | 6 |
| 8 | F Volandri | 6 | 0 | | | | | | | | | | | | 8 | F Volandri | 5 | 6 | 4 |
| | M Gicquel | 1 | 0$^r$ | | 8 | F Volandri | 4 | 7$^7$ | 7$^7$ | | | | | | | | | | |
| | R Ramírez Hidalgo | 5 | 6 | 6 | | R Ramírez Hidalgo | 6 | 6$^4$ | 6$^5$ | | | | | | | | | | |
| | F Vicente | 7 | 0 | 1 | | | | | | 8 | F Volandri | 7$^7$ | 6 | | | | | | |
| Q | F Cipolla | 2 | 1 | | | | | | | | A Portas | 6$^4$ | 4 | | | | | | |
| | J Hernych | 6 | 6 | | | J Hernych | 7 | 4 | 2 | | | | | | | | | | |
| | A Portas | 7$^7$ | 6$^5$ | 7 | | A Portas | 5 | 6 | 6 | | | | | | | | | | |
| 2 | JC Ferrero | 6$^4$ | 7$^7$ | 5 | | | | | | | | | | | | | | | |