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: Yuki Nakai (中井祐樹 , Nakai Yūki ) is a retired Japanese mixed martial artist and Shooter. Yuki Nakai:  He currently teaches shoot wrestling and jiu-jitsu, and is the president of the Japanese Confederation of Jiu-Jitsu.
shoot wrestling and jiu-jitsu