2025 Tiburon Challenger

The 2025 Tiburon Challenger presented by Raymond James was a professional tennis tournament played on outdoor hardcourts. It was the 17th edition of the tournament which was part of the 2025 ATP Challenger Tour. It took place in Tiburon, United States between September 29 and October 5, 2025.

Singles main draw entrants

¹ Rankings are as of September 22, 2025.

The following players received wildcards into the singles main draw:

The following player received entry into the singles main draw using a protected ranking:

The following player received entry into the singles main draw as a special exempt:

The following player received entry into the singles main draw through the Next Gen Accelerator programme:

The following player received entry into the singles main draw as an alternate:

The following players received entry from the qualifying draw:

Michael Zheng def. Tyler Zink 6–4, 6–4.

Finn Reynolds / James Watt def. Benjamin Kittay / Joshua Sheehy 6–2, 6–3.