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Champion Ryan Dungey calls it a career

ANAHEIM, Calif. -- One week after winning his fourth AMA 450SX Supercross championship and his third in as many seasons, KTM motocross rider Ryan Dungey announced his retirement from the sport.

"It's hard to believe that this day has come," Dungey said during an emotional press conference held at Anaheim's Angel Stadium on Tuesday afternoon. "But after a lot of thinking and praying over the past several months, today I announce my retirement from racing professional Supercross and Motocross."

The 450SX champ in 2010 and 2015-2017, Dungey also won the outdoor title three times, the Motocross des Nations championship three times and in his 2010 rookie season, became the youngest rider to win a Supercross championship.