2023 Tiburon Challenger

The 2023 Tiburon Challenger was a professional tennis tournament played on outdoor hard courts. It was the 15th edition of the tournament which was part of the 2023 ATP Challenger Tour. It took place in Tiburon, United States between October 2 and October 8, 2023.

Seeds

 * 1 Rankings are as of September 25, 2023.

Other entrants
The following players received wildcards into the singles main draw:
 * 🇺🇸 Ozan Baris
 * 🇺🇸 Stefan Dostanic
 * 🇺🇸 Learner Tien

The following player received entry into the singles main draw using a protected ranking:
 * 🇺🇸 Christian Harrison

The following players received entry from the qualifying draw:
 * 🇺🇸 Nishesh Basavareddy
 * 🇺🇸 Garrett Johns
 * 🇺🇸 Cannon Kingsley
 * 🇺🇸 Thai-Son Kwiatkowski
 * 🇺🇸 Alfredo Perez
 * 🇨🇦 Brayden Schnur

Singles

 * 🇺🇸 Zachary Svajda def. 🇦🇺 Adam Walton 6–2, 6–2.

Doubles

 * 🇬🇧 Luke Johnson / 🇹🇳 Skander Mansouri def. 🇺🇸 William Blumberg / 🇻🇪 Luis David Martínez 6–2, 6–3.