| 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 8 and 14 October 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:
Sebastian Fanselow Evan King Kevin King Tommy Paul 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 / 
Henri Laaksonen 6–0, 7–6(11–9).The 2016 Levene Gouldin & Thompson Tennis Challenger was a professional tennis tournament played on hard court. It was the 23rd edition of the tournament which was part of the 2016 ATP Challenger Tour. It took place in Binghamton, United States between 18 and 24 July 2016.
The 2015 Fairfield Challenger was a professional tennis tournament played on hard courts. It was the first edition of the tournament which was part of the 2015 ATP Challenger Tour. It took place in Fairfield, California, United States between 12 and 18 October 2015.
The 2016 Fairfield Challenger was a professional tennis tournament played on hard courts. It was the second edition of the tournament which was part of the 2016 ATP Challenger Tour. It took place in Fairfield, California, United States between 10 and 16 October 2016.
The 2017 Fairfield Challenger was a professional tennis tournament played on hard courts. It was the third edition of the tournament which was part of the 2017 ATP Challenger Tour. It took place in Fairfield, California, United States between 9 and 15 October 2017.
The 2017 Las Vegas Challenger was a professional tennis tournament played on hard courts. It was the third edition of the revamped tournament which was the part of the 2017 ATP Challenger Tour. It took place in Las Vegas, United States between 16 and 22 October 2017.
The 2017 Latrobe City Traralgon ATP Challenger was a professional tennis tournament played on outdoor hard court. It was the sixth edition of the tournament which was part of the 2017 ATP Challenger Tour. It took place in Traralgon, Australia between 23–29 October 2017.
The 2018 Kentucky Bank Tennis Championships was a professional tennis tournament played on outdoor hard courts. It was the twenty-third (ATP) and twenty-first (ITF) editions of the tournament and was part of the 2018 ATP Challenger Tour and the 2018 ITF Women's Circuit. It took place in Lexington, United States, on 30 July–5 August 2018.
The 2018 Las Vegas Challenger was a professional tennis tournament played on hard courts. It was the fourth edition of the revamped tournament which was the part of the 2018 ATP Challenger Tour. It took place in Las Vegas, United States between 22 and 28 October 2018.
The 2018 Slovak Open was a professional tennis tournament played on indoor hard courts. It was the 19th edition of the tournament which was part of the 2018 ATP Challenger Tour. It took place in Bratislava, Slovakia between 5 and 11 November 2018.
The 2018 Knoxville Challenger was a professional tennis tournament played on indoor hard courts. It was the fifteenth edition of the tournament which was part of the 2018 ATP Challenger Tour. It took place in Knoxville, United States between 5 and 11 November 2018.
The 2019 Fairfield Challenger was a professional tennis tournament played on hard courts. It was the fifth edition of the tournament which was part of the 2019 ATP Challenger Tour. It took place in Fairfield, California, United States between 7 and 13 October 2019.
The 2019 Ningbo Challenger was a professional tennis tournament played on hard courts. It was the seventh edition of the tournament and part of the 2019 ATP Challenger Tour. It took place in Ningbo, China between 14 and 20 October 2019.
The 2019 Charlottesville Men's Pro Challenger was a professional tennis tournament played on indoor hard courts. It was the eleventh edition of the tournament which was part of the 2019 ATP Challenger Tour, taking place in Charlottesville, United States from October 28 to November 3, 2019.
The 2020 Launceston International was a professional tennis tournament played on hard courts. It was the sixth (men) and ninth (women) editions of the tournament which was part of the 2020 ATP Challenger Tour and the 2020 ITF Women's World Tennis Tour. It took place in Launceston, Tasmania, Australia between 3 and 9 February 2020.
The 2020 Tennis Challenger Hamburg was a professional tennis tournament played on indoor hard courts. It was the second edition of the tournament which was part of the 2020 ATP Challenger Tour. It took place in Hamburg, Germany between 26 October and 1 November 2020.
The 2021 Cleveland Open was a professional tennis tournament played on hard courts. It was the third edition of the tournament which was part of the 2021 ATP Challenger Tour. It took place in Cleveland, Ohio, United States between 15 and 21 March 2021.
The 2021 Kentucky Bank Tennis Championships was a professional tennis tournament played on outdoor hard courts. It was the 25th edition of the tournament and was part of the 2021 ATP Challenger Tour. It took place in Lexington, United States, on 26 July–1 August 2021.
The 2021 Las Vegas Challenger was a professional tennis tournament played on hard courts. It was the sixth edition of the revamped tournament which was the part of the 2021 ATP Challenger Tour. It took place in Las Vegas, United States between 25 and 31 October 2021.
The 2022 Tiburon Challenger was a professional tennis tournament played on outdoor hard courts. It was the fourteenth edition of the tournament which was part of the 2022 ATP Challenger Tour. It took place in Tiburon, United States between 3 and 9 October 2022.
The 2022 Fairfield Challenger was a professional tennis tournament played on hard courts. It was the sixth edition of the tournament which was part of the 2022 ATP Challenger Tour. It took place in Fairfield, California, United States between 10 and 16 October 2022.
