It will be Plessinger's first time competing as a member of the U.S. Motocross of Nations team. He will race in the event's MX2 Class.
"Being selected to race for my country is something I have dreamed about ever since I started riding," Plessinger said. "I'm so excited to get to represent the United States. With the event being held at RedBud MX, it couldn't have been a more perfect year. If you know me, you know representing the red white and blue is part of my lifestyle. I can't wait to see all the fans and hopefully make the Chamberlin Trophy stay here in the United States."
For Tomac, 2018 will be his third time competing in this event. Tomac was a member of the 2013 and 2014 U.S. Motocross of Nations Teams. He will race in the event's MXGP Class.
"Having the opportunity to race in the Motocross of Nations and represent my country in front of the world stage is a feeling like no other," Tomac said. "This year, with it being at RedBud, it's going to be next level for the entire event. Fans will be going absolutely bonkers. Myself, Justin and Aaron will be ready for the battle, and it's a track that suits our riding styles. I have a really good feeling this is the year United States will get the Chamberlain Trophy back."