1. Monster Hunter: World
2. Dragon Ball: Fighterz
3. Call of Duty: WWII
4. Playerunknown's Battlegrounds^
5. Grand Theft Auto V
6. NBA 2K18
7. Super Mario Odyssey**
8. The Legend of Zelda: Breath of the Wild**
9. Mario Kart 8**
10. Madden NFL 18
11. Star Wars: Battlefront II^
12. Assassin's Creed: Origins
13. UFC 3
14. Tom Clancy's Rainbow Six: Siege
15. FIFA 18^
16. Dragon Ball: Xenoverse
17. The Sims 4^
18. Splatoon 2**
19. Dissidia: Final Fantasy NT
20. Need for Speed: Payback

source:  https://www.forbes.com/sites/erikkain/2018/02/22/monster-hunter-world-leads-the-best-selling-video-games-of-january-2018/#66cca7aa7e39