Irmiger, Horgan-Kobelski aim to defend marathon titles at Firecracker 50

Twelve national championship jerseys will be awarded this weekend when athletes from around the country converge on the quaint western town of Breckenridge, Colorado. They will compete on a 50-mile course consisting of two challenging 25-mile loops through the Rocky Mountains. In addition to the championship events, 750 racers will be competing in the 10th annual Firecraker 50.