2018 Engie Open de Biarritz

The 2018 Open de Biarritz was a professional tennis tournament played on outdoor clay courts. It was the sixteenth edition of the tournament and was part of the 2018 ITF Women's Circuit. It took place in Biarritz, France, on 10–16 September 2018.

Seeds

 * 1 Rankings as of 27 August 2018.

Other entrants
The following players received a wildcard into the singles main draw:
 * Timea Bacsinszky
 * 🇫🇷 Chloé Paquet
 * 🇫🇷 Jessika Ponchet
 * 🇫🇷 Harmony Tan

The following player received entry using a protected ranking:
 * 🇷🇺 Alexandra Panova

The following players received entry by special exempts:
 * 🇦🇷 Paula Ormaechea
 * 🇧🇪 Kimberley Zimmermann

The following players received entry from the qualifying draw:
 * 🇫🇷 Marine Partaud
 * 🇪🇸 Olga Sáez Larra
 * 🇧🇬 Isabella Shinikova
 * 🇸🇰 Rebecca Šramková

Singles

 * 🇩🇪 Tamara Korpatsch def. Timea Bacsinszky, 6–2, 7–5

Doubles

 * 🇷🇴 Irina Bara / 🇷🇺 Valentyna Ivakhnenko def. 🇧🇪 Ysaline Bonaventure / 🇧🇪 Hélène Scholsen, 6–4, 6–1