What is the nickname of the challenger who at the K-1 World Grand Prix 2010 in Yokohama was defeated by Kyotaro Fujimoto?
"The Dutch Lumberjack"
Title: K-1 World Grand Prix 2008 Final
Passage: K-1 World Grand Prix 2008 Final was a martial arts event held by the K-1 on Saturday December 6, 2008 at the Yokohama Arena in Yokohama, Japan.  It was the 16th K-1 World GP Final, the culmination of a year full of regional elimination tournaments.  All fights followed the classic 8-man tournament format and were conducted under K-1 rules; three rounds of three minutes each, with a possible tiebreaker.  The qualification for the top eight fighters in this event was held at K-1 World Grand Prix 2008 in Seoul Final 16.
Title: Peter Aerts
Passage: Peter Aerts (born October 25, 1970) is a Dutch semi-retired super heavyweight kickboxer.  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.
Title: Kyotaro Fujimoto
Passage: Kyotaro (Kyōtarō , born 23 June 1986) is a Japanese heavyweight boxer and former kickboxer.  His real name is Kyotaro Fujimoto, and he had been using 3 other ring names before.  He is known for his right hook which has knocked out many of his opponents.  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.  He was also the K-1 World Grand Prix 2008 in Fukuoka tournament finalist and K-1 Young Japan GP 2007 champion.
Kyotaro Fujimoto Peter Aerts