Races in calendar week 16/2018
All motorsport events on the weekend of 20–22 Apr 2018.
| Circuit | Country | Series |
|---|---|---|
| Birmingham (Barber Motorsport Park) |  USA |
|
| Elkhart Lake (Road America) | USA |
|
| Ipswich (Queensland) |  Australia |
|
| Monza |  Italy |
|
| Phillip Island | Australia |
|
| Porto Alegre (Velopark) |  Brazil |
|
| Richmond (oval) | USA |
|
| Suzuka |  Japan |
|