Current standings after rounds 1 & 2 (held on same weekend, wtf??) for USA Cycling MTB National Ultra Endurance Series are posted at this link.
#1 - 15-17/Feb Mas O Menos 100k; Terlingua, TX; 100k
#2 - 17-Feb 12-Hours of Razorback; Reddick, FL; 12-Hour
#3 - 5-6/ May Payson Stampede; Payson, AZ; 24-Hour
#4 - 28-Apr Dirt, Sweat and Gears; Fayettevile, TN; 12-hour
#5 - 23-Jun Cowbel Challenge; Charlotte, NC; 12-hour
#6 - 28-Jul Galena Grinder; Ketchum, ID; marathon
Yours truly is in 8th place in the series and will hopefully move up with a good showing at Dirt, Sweat & Hears 12 Hour. Of the top 15, I believe Nat Ross, Ernie will be there. Plus Tinker will be racing and Sloan Anderson, among others.