| Date: | 17–23 September |
| Edition: | 16th |
| Surface: | Hard / indoors |
| Location: | Metz, France |
| Venue: | Arènes de Metz |
| Champs: |  Gilles Simon |
The 2018 Moselle Open was a men's tennis tournament held in Metz, France and played on indoor hard courts. It was the 16th edition of the Moselle Open, and part of the ATP World Tour 250 series of the 2018 ATP World Tour. It was held at the Arènes de Metz from 17 September to 23 September 2018. Unseeded Gilles Simon won the singles title.[1]
| Country | Player | Rank1 | Seed | |
|---|---|---|---|---|
 Japan | Kei Nishikori | 12 | 1 | |
| Stefanos Tsitsipas | 15 | 2 | ||
| France | ||||
| France | Richard Gasquet | 24 | 4 | |
 Georgia | Nikoloz Basilashvili | 31 | 5 | |
| France | Adrian Mannarino | 32 | 6 | |
 Serbia | Filip Krajinović | 33 | 7 | |
The following players received wild cards into the singles main draw:
The following players received entry from the singles qualifying draw:
The following player received entry as a lucky loser:
Marius Copil → replaced by 
Jürgen Zopp Lucas Pouille → replaced by Grégoire Barrère| Country | Player | Country | Player | Rank1 | Seed | |
|---|---|---|---|---|---|---|
| France | Nicolas Mahut | France | Édouard Roger-Vasselin | 43 | 1 | |
 Pakistan | Aisam-ul-Haq Qureshi |  New Zealand | Artem Sitak | 74 | 2 | |
| Wesley Koolhof |  Argentina | Andrés Molteni | 92 | 3 | ||
 United Kingdom | Ken Skupski | United Kingdom | Neal Skupski | 106 | 4 |
The following pairs received wildcards into the doubles main draw:
The following pair received entry as alternates:
See main article: 2018 Moselle Open – Singles.
Gilles Simon def. Matthias Bachinger, 7–6(7–2), 6–1.See main article: 2018 Moselle Open – Doubles.
Nicolas Mahut / Édouard Roger-Vasselin def. Ken Skupski / Neal Skupski 6–1, 7–5.