2018 Stockton Challenger

The 2018 Stockton Challenger was a professional tennis tournament played on outdoor hard courts. It was the third and fourth editions of the tournament and was part of the 2018 ATP Challenger Tour and the 2018 ITF Women's Circuit. It took place in Stockton, United States, on 1–7 October 2018.

Seeds

 * 1 Rankings are as of September 24, 2018.

Other entrants
The following players received wildcards into the singles main draw:
 * 🇺🇸 Jenson Brooksby
 * 🇺🇸 Tom Fawcett
 * Philip Hjorth
 * 🇺🇸 Thai-Son Kwiatkowski

The following player received entry into the singles main draw as a special exempt:
 * 🇦🇺 James Duckworth

The following player received entry into the singles main draw as an alternate:
 * 🇯🇵 Kaichi Uchida

The following players received entry from the qualifying draw:
 * 🇺🇸 William Blumberg
 * 🇺🇸 Patrick Kypson
 * 🇺🇸 Tommy Paul
 * 🇺🇸 Alexander Sarkissian

Seeds

 * 1 Rankings as of 1 October 2018.

Other entrants
The following players received a wildcard into the singles main draw:
 * 🇺🇸 Hayley Carter
 * 🇺🇸 Victoria Duval
 * 🇺🇸 Jamie Loeb
 * 🇺🇸 Danielle Willson

The following players received entry into the singles main draw using a junior exempt:
 * 🇺🇸 Whitney Osuigwe

The following players received entry from the qualifying draw:
 * 🇺🇸 Maegan Manasse
 * 🇺🇸 Sanaz Marand
 * Amra Sadiković
 * 🇺🇸 Katie Volynets

The following player received entry as a lucky loser:
 * 🇺🇸 Jennifer Elie

Men's singles

 * Lloyd Harris def. 🇦🇺 Marc Polmans 6–2, 6–2.

Women's singles

 * 🇺🇸 Madison Brengle def. 🇺🇸 Danielle Lao, 7–5, 7–6(12–10)

Men's doubles

 * Darian King / 🇺🇸 Noah Rubin def. 🇹🇭 Sanchai Ratiwatana / Christopher Rungkat 6–3, 6–4.

Women's doubles

 * 🇺🇸 Hayley Carter / 🇺🇸 Ena Shibahara def. 🇺🇸 Quinn Gleason / 🇧🇷 Luisa Stefani, 7–5, 5–7, [10–7]