2018 Cassis Open Provence

{{Infobox tennis event|2018|Cassis Open Provence|

| date= 4–9 September

| edition=1st

| surface=Hard

| location=Cassis, France

| champs={{flagicon|FRA}} Enzo Couacaud

| champd={{flagicon|AUS}} Matt Reid / {{flagicon|UKR}} Sergiy Stakhovsky

}}

The 2018 Cassis Open Provence was a professional tennis tournament played on hard courts. It was the 1st edition of the tournament which was part of the 2018 ATP Challenger Tour. It took place in Cassis, France between 4 and 9 September 2018.

Singles main-draw entrants

class="sortable wikitable"
width="70"\| Country ! width="175"\| Player ! Rank¹ ! Seed
{{flag\|LTU}} \|Ričardas Berankis \|104 \|1
{{flag\|FRA}} \|Corentin Moutet \|112 \|2
{{flag\|ESP}} \|Adrián Menéndez Maceiras \|114 \|3
{{flag\|UKR}} \|Sergiy Stakhovsky \|138 \|4
{{flag\|FRA}} \|Ugo Humbert \|139 \|5
{{flag\|AUS}} \|Bernard Tomic \|152 \|6
{{flag\|FRA}} \|Grégoire Barrère \|153 \|7
{{flag\|GER}} \|Mats Moraing \|154 \|8

class="sortable wikitable"

width="70"| Country

! width="175"| Player

! Rank¹

! Seed

|104

|112

|114

|138

|139

|152

|153

|154

¹ Rankings are as of 27 August 2018.{{cite web|url=http://www.atptour.com/en/rankings/singles|title=Rankings – Singles – ATP Tour – Tennis|website=ATP Tour}}

The following players received wildcards into the singles main draw:

The following players received entry from the qualifying draw:

{{flagicon|AUS}} Matt Reid / {{flagicon|UKR}} Sergiy Stakhovsky def. {{flagicon|SUI}} Marc-Andrea Hüsler / {{flagicon|POR}} Gonçalo Oliveira 6–2, 6–3.