2018 Fairfield Challenger

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.

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

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).