2018 Diema Xtra Sofia Open – Doubles
| Doubles | |
|---|---|
| 2018 Diema Xtra Sofia Open | |
| Champions |  Robin Haase  Matwé Middelkoop | 
| Runners-up |  Nikola Mektić  Alexander Peya | 
| Score | 5–7, 6–4, [10–4] | 
| Draw | 16 | 
| Seeds | 4 | 
Viktor Troicki and Nenad Zimonjić were the defending champions, but lost in the first round to Robin Haase and Matwé Middelkoop.
Haase and Middelkoop went on to win the title, defeating Nikola Mektić and Alexander Peya in the final, 5–7, 6–4, [10–4].
Seeds
 Marcin Matkowski / Marcin Matkowski / Aisam-ul-Haq Qureshi (first round) Aisam-ul-Haq Qureshi (first round)
 Nikola Mektić / Nikola Mektić / Alexander Peya (final) Alexander Peya (final)
 Nicholas Monroe / Nicholas Monroe /.svg.png) John-Patrick Smith (semifinals) John-Patrick Smith (semifinals)
 Robin Haase / Robin Haase / Matwé Middelkoop (champions) Matwé Middelkoop (champions)
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 |  M Matkowski  A-u-H Qureshi | 64 | 6 | [8] | |||||||||||||||||||||||
|  R Arneodo  T-S Weissborn | 77 | 1 | [10] |  R Arneodo  T-S Weissborn | 4 | 77 | [5] | ||||||||||||||||||||
| WC |  D Kuzmanov  V Mladenov | 4 | 4 |  S Lipsky  D Sharan | 6 | 64 | [10] | ||||||||||||||||||||
|  S Lipsky  D Sharan | 6 | 6 |  S Lipsky  D Sharan | 4 | 2 | ||||||||||||||||||||||
| 4 |  R Haase  M Middelkoop | 6 | 6 | 4 |  R Haase  M Middelkoop | 6 | 6 | ||||||||||||||||||||
|  V Troicki  N Zimonjić | 4 | 4 | 4 |  R Haase  M Middelkoop | 7 | 5 | [10] | ||||||||||||||||||||
|  R Lindstedt .svg.png) D Nestor | 3 | 77 | [10] |  R Lindstedt .svg.png) D Nestor | 5 | 7 | [4] | ||||||||||||||||||||
|  J Erlich  P Petzschner | 6 | 65 | [5] | 4 |  R Haase  M Middelkoop | 5 | 6 | [10] | |||||||||||||||||||
| WC |  A Donski  A Lazov | 3 | 4 | 2 |  N Mektić  A Peya | 7 | 4 | [4] | |||||||||||||||||||
|  J Cerretani .svg.png) S Gillé | 6 | 6 |  J Cerretani .svg.png) S Gillé | 3 | 77 | [3] | |||||||||||||||||||||
|  M Copil  F Mergea | 6 | 1 | [6] | 3 |  N Monroe .svg.png) J-P Smith | 6 | 62 | [10] | |||||||||||||||||||
| 3 |  N Monroe .svg.png) J-P Smith | 4 | 6 | [10] | 3 |  N Monroe .svg.png) J-P Smith | 2 | 4 | |||||||||||||||||||
| Alt |  R Shandarov  V Shandarov | 1 | 2 | 2 |  N Mektić  A Peya | 6 | 6 | ||||||||||||||||||||
|  M Marterer .svg.png) J Sousa | 6 | 6 |  M Marterer .svg.png) J Sousa | 3 | 3 | ||||||||||||||||||||||
|  E Donskoy  M Youzhny | 2 | 4 | 2 |  N Mektić  A Peya | 6 | 6 | |||||||||||||||||||||
| 2 |  N Mektić  A Peya | 6 | 6 | ||||||||||||||||||||||||