Round 1 - AMA Supercross Championship - January 7, 2018
 
Next Race: Houston, Texas – January 13, 2018  
Results 450SX Class Anaheim I 2018
1. Marvin Musquin (FRA), KTM, 21:20.367 min (24 laps) 
 
2. Jason Anderson (USA), Husqvarna, +2.579
 
3. Justin Barcia (USA), Yamaha, +4.629
 
4. Ken Roczen (GER), Honda, +12.826
 
5. Weston Peick (USA), Suzuki, +15.694
 
Standings 450SX Class 2018 after 1 of 17 rounds
 
1. Musquin, 26 points
 
2. Anderson, 23
 
3. Barcia, 21
 
4. Roczen, 19
 
5. Peick, 18
 
Results 250SX West Class Anaheim I 2018
 
1. Shane McElrath (USA), KTM, 16:01.193 min (18 laps)
 
2. Aaron Plessinger (USA), Yamaha, +2.521 sec
 
3. Adam Cianciarulo (USA), Kawasaki, +4.609
 
4. Joey Savatgy (USA), Kawasaki, +8.508
 
5. Christian Craig (USA), Honda, +16.061
 
Standings 250SX West Class 2018 after 1 of 17 rounds
 
1. McElrath, 26 points
 
2. Plessinger, 23
 
3. Cianciarulo, 21
 
4. Savatgy, 19
 
5. Craig, 18