2018 Tiburon Challenger

Country	Player	Rank1	Seed
ESP	Marcel Granollers	102	1
AUS	Jordan Thompson	111	2
CAN	Peter Polansky	113	3
SUI	Henri Laaksonen	121	4
USA	Michael Mmoh	124	5
USA	Noah Rubin	138	6
AUS	Marc Polmans	163	7
USA	Bjorn Fratangelo	169	8

• ¹ Rankings are as of September 17, 2018.

The following players received wildcards into the singles main draw:

• JC Aragone
• Tom Fawcett
• Brandon Holt
• Tommy Paul

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

• Mikael Torpegaard

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

• James Duckworth

The following players received entry from the qualifying draw:

• Steven Diez
• Cem İlkel
• Roberto Ortega Olmedo
• Alexander Sarkissian

• Michael Mmoh def. Marcel Granollers 6–3, 7–5.

• Hans Hach Verdugo / Luke Saville def. Gerard Granollers / Pedro Martínez 6–3, 6–2.