With the Mas O Menos 100K and the 12-Hours of Santos contested so far, Jason Sager and Christina Smith lead the USA Cycling Mountain Bike National Ultra-Endurance Calendar standings. The next event on the USA Cycling Mountain Bike National Ultra-Endurance Calendar will be the 12-hour race at Dirt, Sweat and Gears, May 2-3 in Fayetteville, Tenn.