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. Singles main-draw entrants Seeds 1 Rankings are as of October 1, 2018. Other entrants The following players received wildcards into the singles main draw: Collin Altamirano Axel Geller Alex Rybakov J. J. Wolf The following player received entry into the singles main draw as a special exempt: Maxime Janvier The following player received entry into the singles main draw as an alternate: Darian King 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: Mitchell Krueger Champions Singles Bjorn Fratangelo def. Alex Bolt 6–4, 6–3. Doubles Sanchai Ratiwatana / Christopher Rungkat def. Harri Heliövaara / Henri Laaksonen 6–0, 7–6(11–9). References 2018 ATP Challenger Tour October 2018 sports events in the United States Fairfield Challenger