Seth Hammaker

Seth Hammaker is an American professional motocross and supercross racer, born on 29 September 2000 in Bainbridge, Pennsylvania. He turned professional in 2021 and has ridden his whole career so far for the Monster Energy Pro Circuit Kawasaki team in the 250 classes. After rising through the American amateur ranks, including a Super Mini 1 title at the 2016 AMA Amateur National Motocross Championship and a place in the Team Green Kawasaki amateur programme, he won the Arlington round of the 2021 AMA Supercross Championship in only his third professional start and was named AMA Supercross Rookie of the Year. Injuries have repeatedly interrupted his seasons, yet he finished runner-up in the 250SX East class of the 2025 and 2026 AMA Supercross Championship and runner-up in the 250SMX class of the 2025 SuperMotocross World Championship. He took his first outdoor overall win at the opening round of the 2026 AMA National Motocross Championship.