| Date: | 1–6 January |
| Edition: | 26th |
| Category: | ATP World Tour 250 series |
| Draw: | 32S/16D |
| Surface: | Hard / outdoor |
| Location: | Doha, Qatar |
| Champs: |  Gaël Monfils[1] |
| Champd: |  Oliver Marach / Mate Pavić[2] |
| Main Name: | ATP Qatar Open |
The 2018 Qatar Open (also known as 2018 Qatar ExxonMobil Open for sponsorship reasons) was a men's tennis tournament played on outdoor hard courts. It was the 26th edition of the Qatar Open, and part of the ATP World Tour 250 series of the 2018 ATP World Tour. It took place at the Khalifa International Tennis and Squash Complex in Doha, Qatar, from 1 January until 6 January 2018. Unseeded Gaël Monfils, who entered the main draw on a wildcard, won the singles title.
See main article: 2018 Qatar ExxonMobil Open – Singles. Gaël Monfils defeated 
Andrey Rublev, 6–2, 6–3
See main article: 2018 Qatar ExxonMobil Open – Doubles. Oliver Marach / Mate Pavić defeated 
Jamie Murray / 
Bruno Soares, 6–2, 7–6(8–6)
| Event | W | F | SF | QF | Round of 16 | Round of 32 | width=85 | Q | width=85 | Q2 | width=85 | Q1 |
| Singles | 250 | 150 | 90 | 45 | 20 | 0 | 12 | 6 | 0 | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubles | 0 |
| Event | W | F | SF | QF | Round of 16 | Round of 32 | width=85 | Q2 | width=85 | Q1 |
| Singles | $218,180 | $114,900 | $62,240 | $35,460 | $20,895 | $12,380 | $5,570 | $2,785 | ||
| Doubles | $69,870 | $36,730 | $19,900 | $11,390 | $6,670 | |||||
| Doubles prize money per team | ||||||||||
| Country | Player | Rank1 | Seed | |
|---|---|---|---|---|
| Austria | Dominic Thiem | 5 | 1 | |
 Spain | Pablo Carreño Busta | 10 | 2 | |
 Czech Republic | Tomáš Berdych | 19 | 3 | |
| Spain | Albert Ramos Viñolas | 23 | 4 | |
| France | Richard Gasquet | 31 | 5 | |
 Serbia | Filip Krajinović | 34 | 6 | |
| Spain | Fernando Verdasco | 35 | 7 | |
| Spain | Feliciano López | 36 | 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 alternate:
Novak Djokovic →replaced by 
Víctor Estrella Burgos Jo-Wilfried Tsonga →replaced by Cedrik-Marcel Stebe| Country | Player | Country | Player | Rank1 | Seed | |
|---|---|---|---|---|---|---|
| United Kingdom | Jamie Murray | Brazil | Bruno Soares | 19 | 1 | |
| Austria | Oliver Marach | Mate Pavić | 36 | 2 | ||
| Spain | Feliciano López | Rajeev Ram | 46 | 3 | ||
| Ivan Dodig | Spain | Fernando Verdasco | 71 | 4 |
The following pairs received wildcards into the doubles main draw:
