Masakatsu Ueda is a MMA fighter who is a blue belt under the martial artist who teaches which two disciplines?
Masakatsu Ueda:  He is a blue belt in Brazilian Jiu-Jitsu under Yuki Nakai. Yuki Nakai:  He currently teaches shoot wrestling and jiu-jitsu, and is the president of the Japanese Confederation of Jiu-Jitsu.
i don't know