The 2018 Tiburon Challenger was a professional tennis tournament played on outdoor hard courts.

It was the twelfth edition of the tournament which was part of the 2018 ATP Challenger Tour.

It took place in Tiburon, United States between September 24 and September 30, 2018.

[1][2] The following players received wildcards into the singles main draw: The following player received entry into the singles main draw as a special exempt: The following player received entry into the singles main draw as an alternate: The following players received entry from the qualifying draw: