Dallas Seavey and Aaron Burmeister are running neck-and-neck down the Yukon River, leading the Iditarod field between Tanana and Ruby.
Mitch Seavey and Martin Buser are running in third and fourth place, respectively, trailing the Iditarod leaders by less than two miles.
The leg between Tanana and Ruby is the longest of the race, spanning 119 miles.