| 2019 Tiburon Challenger | |
|---|---|
| Date | 23–29 September |
| Edition | 13th |
| Draw | 48S / 16D |
| Surface | Hard |
| Location | Tiburon, United States |
| Champions | |
| Singles | |
 Tommy Paul | |
| Doubles | |
Robert Galloway /  Roberto Maytín | |
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.
| Country | Player | Rank1 | Seed |
|---|---|---|---|
| USA | Tommy Paul | 88 | 1 |
| USA | Denis Kudla | 107 | 2 |
| USA | Marcos Giron | 125 | 3 |
 ECU | Emilio Gómez | 166 | 4 |
 DEN | Mikael Torpegaard | 167 | 5 |
| USA | Michael Mmoh | 168 | 6 |
 BAR | Darian King | 170 | 7 |
 AUS | Thanasi Kokkinakis | 181 | 8 |
 FRA | Enzo Couacaud | 187 | 9 |
| USA | Christopher Eubanks | 190 | 10 |
| USA | Mitchell Krueger | 192 | 11 |
 CAN | Peter Polansky | 200 | 12 |
 COL | Daniel Elahi Galán | 201 | 13 |
| USA | Thai-Son Kwiatkowski | 209 | 14 |
| USA | Ernesto Escobedo | 215 | 15 |
| USA | Maxime Cressy | 228 | 16 |
The following players received wildcards into the singles main draw:
The following players received entry into the singles main draw using protected rankings:
The following players received entry from the qualifying draw:
Tommy Paul def. Thanasi Kokkinakis 7–5, 6–7(3–7), 6–4. Robert Galloway / Roberto Maytín def. JC Aragone / Darian King 6–2, 7–5.
