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.
Singles main-draw entrants
Seeds
1 Rankings are as of September 30, 2019.
Other entrants
The following players received wildcards into the singles main draw: Brandon Holt Steve Johnson Brandon Nakashima Alex Rybakov Zachary Svajda
The following player received entry into the singles main draw as an alternate: Strong Kirchheimer
The following players received entry from the qualifying draw: Felix Corwin Sem Verbeek
The following player received entry as a lucky loser: Dennis Novikov
Champions
Singles
Christopher O'Connell def. Steve Johnson 6–4, 6–4.
Doubles
Darian King / Peter Polansky def. André Göransson / Sem Verbeek 6–4, 3–6, [12–10].