2019 Tiburon Challenger

The 2019 Tiburon Challenger was a professional tennis tournament played on outdoor hard courts. It was the thirteenth edition of the tournament which was part of the 2019 ATP Challenger Tour. It took place in Tiburon, California, United States, between September 23 and September 29, 2019.

Seeds

 * 1 Rankings are as of September 16, 2019.

Other entrants
The following players received wildcards into the singles main draw:
 * 🇺🇸 Oliver Crawford
 * 🇺🇸 Brandon Holt
 * 🇺🇸 Brandon Nakashima
 * 🇺🇸 Emilio Nava
 * 🇨🇿 Ondřej Štyler

The following players received entry into the singles main draw using protected rankings:
 * 🇪🇸 Carlos Gómez-Herrera
 * 🇺🇸 Raymond Sarmiento

The following players received entry from the qualifying draw:
 * 🇧🇪 Michael Geerts
 * 🇺🇸 Evan Zhu

Singles

 * 🇺🇸 Tommy Paul def. 🇦🇺 Thanasi Kokkinakis 7–5, 6–7(3–7), 6–4.

Doubles

 * 🇺🇸 Robert Galloway / 🇻🇪 Roberto Maytín def. 🇺🇸 JC Aragone / Darian King 6–2, 7–5.