Haiden Deegan to Make 450cc Debut in Argentina and Australia for 2025 WSX
American motocross rising star steps into SX1 class with wild-card 450 starts at World Supercross rounds in Buenos Aires and Gold Coast
American motocross prodigy Haiden Deegan will step up to the 450 cc class for two wild-card starts in the 2025 FIM World Supercross Championship (WSX), officially competing in Argentina on November 8 and Australia on November 29. His first international appearance comes in Buenos Aires and will be followed by his Australian debut at Cbus Super Stadium on the Gold Coast.
Deegan—riding the Monster Energy Yamaha Star Racing YZ450F—was originally entered in the SX2 (250cc) class for the Argentina round but the late change elevates him into the SX1 (450cc) division, where he will race against 450cc specialists and world-class supercross names.
At just 19 years old, he already holds multiple U.S. championships and brings high pace, charisma and a growing global following.
In making the leap to 450cc for these wildcard events, Deegan signals his intention to transition to the premier class full-time in coming seasons, likely continuing his 250cc U.S. campaign in 2026 before stepping up completely to 450cc motocross.
His international wildcard appearances reflect a growing trend of U.S. talent testing global series and affirm WSX’s status as a premier supercross platform.
Organisers say Deegan’s inclusion adds further star power to an already stacked field and helps raise the championship’s global profile ahead of its five-round calendar.
Fans in Argentina and Australia will have the chance to witness a major milestone in Deegan’s career as he tackles the world stage and a step up to 450cc competition for the first time.
The wildcard starts do not affect his eligibility in U.S. national competition and allow Deegan to gain valuable international experience.
With his 450cc debut imminent, all eyes will be on how the young star adapts to the premier class in a global setting.
Deegan—riding the Monster Energy Yamaha Star Racing YZ450F—was originally entered in the SX2 (250cc) class for the Argentina round but the late change elevates him into the SX1 (450cc) division, where he will race against 450cc specialists and world-class supercross names.
At just 19 years old, he already holds multiple U.S. championships and brings high pace, charisma and a growing global following.
In making the leap to 450cc for these wildcard events, Deegan signals his intention to transition to the premier class full-time in coming seasons, likely continuing his 250cc U.S. campaign in 2026 before stepping up completely to 450cc motocross.
His international wildcard appearances reflect a growing trend of U.S. talent testing global series and affirm WSX’s status as a premier supercross platform.
Organisers say Deegan’s inclusion adds further star power to an already stacked field and helps raise the championship’s global profile ahead of its five-round calendar.
Fans in Argentina and Australia will have the chance to witness a major milestone in Deegan’s career as he tackles the world stage and a step up to 450cc competition for the first time.
The wildcard starts do not affect his eligibility in U.S. national competition and allow Deegan to gain valuable international experience.
With his 450cc debut imminent, all eyes will be on how the young star adapts to the premier class in a global setting.
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