2023 Fairfield Challenger

The 2023 Fairfield Challenger was a professional tennis tournament played on hard courts. It was the seventh edition of the tournament which was part of the 2023 ATP Challenger Tour. It took place in Fairfield, California, United States between October 9 and October 15, 2023.

Seeds

 * 1 Rankings are as of September 25, 2023.

Other entrants
The following players received wildcards into the singles main draw:
 * 🇺🇸 Ozan Baris
 * 🇺🇸 Thai-Son Kwiatkowski
 * 🇺🇸 Aidan Mayo

The following players received entry into the singles main draw using protected rankings:
 * 🇺🇸 Christian Harrison
 * 🇨🇦 Brayden Schnur

The following players received entry into the singles main draw as alternates:
 * 🇺🇸 Christian Langmo
 * 🇹🇳 Skander Mansouri

The following players received entry from the qualifying draw:
 * 🇺🇸 Stefan Dostanic
 * August Holmgren
 * 🇺🇸 Strong Kirchheimer
 * 🇺🇸 Alfredo Perez
 * 🇺🇸 Keegan Smith
 * 🇺🇸 Learner Tien

The following player received entry as a lucky loser:
 * 🇦🇷 Federico Agustín Gómez

Singles

 * 🇺🇸 Zachary Svajda def. 🇺🇸 Nishesh Basavareddy 6–4, 6–1.

Doubles

 * 🇺🇸 Evan King / 🇺🇸 Reese Stalder def. 🇺🇸 Vasil Kirkov / 🇺🇸 Denis Kudla 7–5, 6–3.