Question: What is the nickname of the challenger who at the K-1 World Grand Prix 2010 in Yokohama was defeated by Kyotaro Fujimoto?
Sentence (from "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.
Relevant evidence: Yes