At the 2018 Open Sud de France (part of the ATP Tour 250 series held in Montpellier), Ben McLachlan (representing Japan) and Hugo Nys (representing France) were seeded first in doubles.
It was the 31st edition of the Open Sud de France, and part of the ATP World Tour 250 Series of the 2018 ATP World Tour. It took placed at the Arena Montpellier in Montpellier, France, from February 5 to February 11, 2018. Ben McLachlan 4 
