2018 Nordic Naturals Challenger

The 2018 Nordic Naturals Challenger was a professional tennis tournament played on hard courts. It was the 31st edition of the tournament which was part of the 2018 ATP Challenger Tour. It took place in Aptos, California, United States between 6 and 12 August 2018.

Seeds

 * 1 Rankings are as of July 30, 2018.

Other entrants
The following players received wildcards into the singles main draw:
 * 🇺🇸 Ulises Blanch
 * 🇺🇸 Brandon Holt
 * 🇺🇸 Michael Mmoh
 * 🇺🇸 Martin Redlicki

The following player received entry into the singles main draw using a protected ranking:
 * 🇺🇦 Illya Marchenko

The following players received entry into the singles main draw using special exempts:
 * 🇧🇪 Joris De Loore
 * 🇮🇹 Stefano Napolitano

The following players received entry from the qualifying draw:
 * 🇺🇸 Marcos Giron
 * 🇦🇺 Luke Saville
 * 🇦🇺 Aleksandar Vukic
 * 🇬🇧 Alexander Ward

Singles

 * 🇦🇺 Thanasi Kokkinakis def. Lloyd Harris 6–2, 6–3.

Doubles

 * 🇦🇺 Thanasi Kokkinakis / 🇦🇺 Matt Reid def. 🇬🇧 Jonny O'Mara / 🇬🇧 Joe Salisbury 6–2, 4–6, [10–8].