See main article: article and 2018 Engie Open de Biarritz.
The 2018 Engie Open de Biarritz – Singles was the singles event of the Open de Biarritz, a professional women's tennis tournament played on outdoor clay courts in the city of Biarritz, in France.
Mihaela Buzărnescu was the defending champion but chose not to participate.
Tamara Korpatsch won the title, defeating Timea Bacsinszky in the final, 6–2, 7–5.