January 13, 2018 NRG Stadium

Houston, TX

Joey Savatgy took the holeshot in the 250 main event, but was not able to pull away from the pack. Shane McElrath, Adam Cianciarulo and Christian Craig all stayed close behind for the first half of the race. Cianciarulo worked his way past McElrath and started putting pressure on Savatgy with about 8 minutes left and ended up tipping over in a turn and falling back to fifth place.
After a bad start, Aaron Plessinger finally worked his way to second place with six minutes left, passing McElrath when McElrath bobbled off the track. Plessinger started showing Savatgy a front wheel at the four-minute mark, as the two started pulling away from the pack. Plessinger finally grabbed the lead about a minute later and pulled away for the win.
In the 450 class, Eli Tomac withdrew after qualifying due to a shoulder injury suffered last week. Points leader Marvin Musquin crashed in his heat race and injured his shoulder, and was unable to finish the night.
Ken Roczen and Justin Barcia started out front, with Roczen eventually getting in front of Barcia for good. Roczen was slowly pulling away from the pack, before Jason Anderson came along and got past Roczen a little over halfway through the main. Anderson pulled away for the win and the points lead.