What is the nickname of the challenger who at the K-1 World Grand Prix 2010 in Yokohama was defeated by Kyotaro Fujimoto?
Kyotaro Fujimoto:  He is currently the K-1 Heavyweight Champion and has successfully defended the title against Peter Aerts at K-1 World Grand Prix 2010 in Yokohama. Peter Aerts:  Known for his devastating high kicks, which earned him the nickname "The Dutch Lumberjack", he is widely considered to be one of the greatest heavyweight kickboxers ever.
"The Dutch Lumberjack"