Defending champion Lance Mackey and past winners Jeff King and Martin Buser have signed up in person for the 2010 Iditarod Trail Sled Dog Race.

Altogether, 58 mushers were registered to compete in the 1,100-mile race to Nome in March, with 22 showing up at Iditarod headquarters to turn in their entry forms on Saturday, the first day to sign up.

The 43 race veterans and 15 rookies will be competing for a purse of about $630,000, with $610,000 earmarked for the top 30 contenders.

Under new rules, mushers had the option of signing up Saturday at the annual Iditarod volunteers picnic, or submitting entry forms and the $4,000 race fee by mail in time to be recorded at the picnic, which gives them an edge in the lineup.