2018 Fairfield Challenger – Doubles
| Doubles | |
|---|---|
| 2018 Fairfield Challenger | |
| Champions |  Sanchai Ratiwatana  Christopher Rungkat | 
| Runners-up |  Harri Heliövaara .svg.png) Henri Laaksonen | 
| Score | 6–0, 7–6(11–9) | 
Luke Bambridge and David O'Hare were the defending champions but chose not to defend their title.
Sanchai Ratiwatana and Christopher Rungkat won the title after defeating Harri Heliövaara and Henri Laaksonen 6–0, 7–6(11–9) in the final.
Seeds
 Sanchai Ratiwatana / Sanchai Ratiwatana / Christopher Rungkat (champions) Christopher Rungkat (champions)
 Ruan Roelofse / Ruan Roelofse /.svg.png) John-Patrick Smith (quarterfinals) John-Patrick Smith (quarterfinals)
 Evan King / Evan King / Nathan Pasha (first round) Nathan Pasha (first round)
 Toshihide Matsui / Toshihide Matsui / Frederik Nielsen (first round) Frederik Nielsen (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
| First round | Quarterfinals | Semifinals | Final | ||||||||||||||||||||||||
| 1 |  Sa Ratiwatana  C Rungkat | 6 | 6 | ||||||||||||||||||||||||
| .svg.png) T Kokkinakis .svg.png) M Reid | 3 | 4 | 1 |  Sa Ratiwatana  C Rungkat | 6 | 5 | [10] | ||||||||||||||||||||
| Q |  A Göransson  A Siljeström | 6 | 2 | [6] | WC |  H Johnson  Y Johnson | 4 | 7 | [6] | ||||||||||||||||||
| WC |  H Johnson  Y Johnson | 4 | 6 | [10] | 1 |  Sa Ratiwatana  C Rungkat | 6 | 6 | |||||||||||||||||||
| 3 |  E King  N Pasha | 3 | 5 | .svg.png) M-A Hüsler  S Verbeek | 4 | 4 | |||||||||||||||||||||
| WC |  JC Aragone  M Krueger | 6 | 7 | WC |  JC Aragone  M Krueger | 2 | 4 | ||||||||||||||||||||
| .svg.png) M-A Hüsler  S Verbeek | 6 | 6 | .svg.png) M-A Hüsler  S Verbeek | 6 | 6 | ||||||||||||||||||||||
|  H Hach Verdugo  A Menéndez Maceiras | 4 | 4 | 1 |  Sa Ratiwatana  C Rungkat | 6 | 711 | |||||||||||||||||||||
| PR |  L Harris  D O'Brien | 5 | 4 |  H Heliövaara .svg.png) H Laaksonen | 0 | 69 | |||||||||||||||||||||
|  R Galloway  R Maytín | 7 | 6 |  R Galloway  R Maytín | w/o | |||||||||||||||||||||||
|  A Lawson  H Reese | 6 | 77 |  A Lawson  H Reese | ||||||||||||||||||||||||
| 4 |  T Matsui  F Nielsen | 3 | 63 |  R Galloway  R Maytín | 5 | 4 | |||||||||||||||||||||
|  H Heliövaara .svg.png) H Laaksonen | 77 | 77 |  H Heliövaara .svg.png) H Laaksonen | 7 | 6 | ||||||||||||||||||||||
|  R Gonzales  N Lammons | 62 | 62 |  H Heliövaara .svg.png) H Laaksonen | 3 | 6 | [10] | |||||||||||||||||||||
| WC |  D Nguyen  M Seeberger | 77 | 3 | [5] | 2 |  R Roelofse .svg.png) J-P Smith | 6 | 2 | [7] | ||||||||||||||||||
| 2 |  R Roelofse .svg.png) J-P Smith | 64 | 6 | [10] | |||||||||||||||||||||||