The 2018 Grand Prix Hassan II was a professional tennis tournament played on clay courts. It was the 34th edition of the tournament and part of the 2018 ATP World Tour. It took place in Marrakesh, Morocco between 9 and 15 April 2018.
| Country | Player | Rank1 | Seed | |
|---|---|---|---|---|
 Spain | Albert Ramos Viñolas | 23 | 1 | |
 United Kingdom | Kyle Edmund | 26 | 2 | |
| Philipp Kohlschreiber | 34 | 3 | ||
 France | Richard Gasquet | 38 | 4 | |
| Robin Haase | 44 | 5 | ||
| France | Benoît Paire | 47 | 6 | |
 Ukraine | Alexandr Dolgopolov | 53 | 7 | |
| Mischa Zverev | 55 | 8 |
The following players received wildcards into the singles main draw:
The following players received entry using a protected ranking:
The following players received entry from the qualifying draw:
The following player received entry as a lucky loser:
Pablo Andújar
Federico Delbonis → replaced by 
Radu Albot
Damir Džumhur → replaced by 
Nikoloz Basilashvili
Filip Krajinović → replaced by Roberto Carballés Baena Gaël Monfils → replaced by 
Matteo Berrettini Viktor Troicki → replaced by 
Ilya Ivashka| Country | Player | Country | Player | Rank1 | Seed | |
|---|---|---|---|---|---|---|
| Nikola Mektić |  Austria | Alexander Peya | 69 | 1 | ||
| Spain | Marc López | Serbia | Nenad Zimonjić | 86 | 2 | |
 New Zealand | Marcus Daniell | United Kingdom | Dominic Inglot | 87 | 3 | |
| Robin Haase | Matwé Middelkoop | 90 | 4 |
The following pairs received wildcards into the doubles main draw:
See main article: 2018 Grand Prix Hassan II – Singles.
Pablo Andújar defeated Kyle Edmund, 6–2, 6–2See main article: 2018 Grand Prix Hassan II – Doubles.
Alexander Peya defeated Benoît Paire / Édouard Roger-Vasselin, 7–5, 3–6, [10–7]
