2021 Croatia Open Umag – Doubles
2021 tennis event results
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Robin Haase and Philipp Oswald were the reigning champions from when the tournament was last held in 2019,[1] but chose not to defend their title.
2019Champions
Robin Haase
Philipp Oswald
Robin Haase 
Philipp OswaldChampions
Fernando Romboli
David Vega Hernández
Fernando Romboli
David Vega HernándezRunners-up
Tomislav Brkić
Nikola Ćaćić
Tomislav Brkić
Nikola ĆaćićScore6–3, 7–5
| Doubles | |
|---|---|
| 2021 Croatia Open Umag | |
| 2019 Champions | Robin Haase Philipp Oswald |
| Champions | Fernando Romboli David Vega Hernández |
| Runners-up | Tomislav Brkić Nikola Ćaćić |
| Score | 6–3, 7–5 |
| Draw | 16 |
| Seeds | 4 |
Fernando Romboli and David Vega Hernández won the title, defeating Tomislav Brkić and Nikola Ćaćić in the final, 6–3, 7–5.[2]
Seeds
- Tomislav Brkić / Nikola Ćaćić (final)
Pablo Cuevas / 
Fabrice Martin (first round)- Rafael Matos /
Andrei Vasilevski (first round) 
Luis David Martínez / 
Artem Sitak (first round)
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
Draw
| First round | Quarterfinals | Semifinals | Final | ||||||||||||||||||||||||
| 1 | T Brkić N Ćaćić
| 6 | 3 | [10] | |||||||||||||||||||||||
| WC |  D Ajduković F Ninčević
| 4 | 6 | [8] | 1 | T Brkić N Ćaćić
| 6 | 6 | |||||||||||||||||||
 R Jebavý J Veselý
| 7 | 6 | R Jebavý J Veselý
| 2 | 2 | ||||||||||||||||||||||
| C Taberner B Zapata Miralles
| 5 | 3 | 1 | T Brkić N Ćaćić
| 6 | 6 | |||||||||||||||||||||
| 4 |  LD Martinez A Sitak
| 6 | 61 | [6] | I Sabanov M Sabanov
| 1 | 2 | ||||||||||||||||||||
| I Sabanov M Sabanov
| 3 | 77 | [10] | I Sabanov M Sabanov
| 7 | 6 | |||||||||||||||||||||
 S Caruso G Mager
| 78 | 2 | [6] | D Džumhur A Šančić
| 5 | 0 | |||||||||||||||||||||
| D Džumhur A Šančić
| 66 | 6 | [10] | 1 | T Brkić N Ćaćić
| 3 | 5 | ||||||||||||||||||||
 R Albot P Martínez
| 6 | 77 | F Romboli D Vega Hernández
| 6 | 7 | ||||||||||||||||||||||
 A Begemann I Zelenay
| 4 | 65 | R Albot P Martínez
| 6 | 6 | ||||||||||||||||||||||
| M Cecchinato S Travaglia
| 7 | 6 | M Cecchinato S Travaglia
| 4 | 1 | ||||||||||||||||||||||
| 3 | R Matos A Vasilevski
| 5 | 4 | R Albot P Martínez
| 6 | 68 | [7] | ||||||||||||||||||||
| PR | M López J Munar
| 5 | 6 | [5] | F Romboli D Vega Hernández
| 4 | 710 | [10] | |||||||||||||||||||
| F Romboli D Vega Hernández
| 7 | 4 | [10] | F Romboli D Vega Hernández
| 3 | 7 | [16] | ||||||||||||||||||||
| WC | A Kalender M Poljičak
| 6 | 6 | WC | A Kalender M Poljičak
| 6 | 5 | [14] | |||||||||||||||||||
| 2 |  P Cuevas F Martin
| 3 | 4 | ||||||||||||||||||||||||