| 2018 Fairfield Challenger | |
|---|---|
| Date | 8–14 October |
| Edition | 4th |
| Surface | Hard |
| Location | Fairfield, California, United States |
| Champions | |
| Singles | |
 Bjorn Fratangelo | |
| Doubles | |
 Sanchai Ratiwatana /  Christopher Rungkat | |
The 2018 Fairfield Challenger was a professional tennis tournament played on hard courts. It was the fourth edition of the tournament which was part of the 2018 ATP Challenger Tour. It took place in Fairfield, California, United States between October 8 and October 14, 2018.
| Country | Player | Rank1 | Seed |
|---|---|---|---|
 AUS | Jordan Thompson | 106 | 1 |
 RSA | Lloyd Harris | 121 | 2 |
| USA | Noah Rubin | 127 | 3 |
| USA | Reilly Opelka | 129 | 4 |
 ESP | Adrián Menéndez Maceiras | 130 | 5 |
 NOR | Casper Ruud | 135 | 6 |
 CRO | Ivo Karlović | 137 | 7 |
| AUS | Alex Bolt | 158 | 8 |
The following players received wildcards into the singles main draw:
The following player received entry into the singles main draw as a special exempt:
The following player received entry into the singles main draw as an alternate:
The following players received entry from the qualifying draw:
The following player received entry as a lucky loser:
Bjorn Fratangelo def. Alex Bolt 6–4, 6–3. Sanchai Ratiwatana / Christopher Rungkat def. 
Harri Heliövaara / 
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