Question: Masakatsu Ueda is a MMA fighter who is a blue belt under the martial artist who teaches which two disciplines?

Context paragraphs:
Guy Mezger: Guy Mezger (born January 1, 1968) is an American martial artist, who competed in professional combat sports including full contact karate, kickboxing, and boxing, but is most recognized as a mixed martial arts (MMA) fighter.  Mezger retired from professional competition on January 25, 2005.  He is associated with Lion's Den and runs their school in Dallas.  Mezger was a champion in mixed martial arts in two different promotions, the UFC and Pancrase.  He holds wins over Tito Ortiz, Masakatsu Funaki, Yuki Kondo, Semmy Schilt, and Minoru Suzuki.

Midnight Blue Belt: Midnight Blue Belt is a belt worn in some Korean martial arts to signify that the wearer has attained "dan" rank, which translates to a degree holder.  This belt is most commonly seen in the Korean martial arts of tang soo do and soo bahk do, where it is often used in place of the more common black belt.  Its origin lies in Hwang Kee, who used it to denote "dan" holders in the Soo Bahk Do Moo Duk Kwan.  In tang soo do, black is viewed as a colour that does not become darker, and thus signifies an end (death), whereas midnight blue represents more positive concepts, such as the element of Water.

Masakatsu Ueda: Masakatsu Ueda (born December 21, 1977) is a professional Japanese mixed martial artist who currently competes in the bantamweight division (known as featherweight in Shooto) for Shooto where he is the former Featherweight champion.  Ueda won the vacant title after defeating Koetsu Okazai on March 28, 2008, by Unanimous Decision at Shooto's Back To Our Roots 8 show.  Ueda was also a college level wrestler in Japan where holds a win over fellow mixed martial artist and Japanese Superstar Norifumi Yamamoto, better known as "Kid" Yamamoto.  Ueda has also won many national titles in Combat Wrestling.  He also won the All Japan Shooto Grappling championship, and both A and B class Shooto Rookie Tournaments.  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.  He currently teaches shoot wrestling and jiu-jitsu, and is the president of the Japanese Confederation of Jiu-Jitsu.  He competed in Shooto, a proto-MMA promotion; as well as Vale Tudo Japan 1995, where he was outweighed by every opponent in the tournament.  Despite this, and despite suffering a severe eye injury in the first bout, Nakai managed to make it to the finals where he lost to Rickson Gracie.  Nakai is a legend of Shooto by many fighters and fans.  He is the founder of the Paraestra Shooto Gym and coaches fighters such as PRIDE and DREAM stand out Shinya Aoki, who also earned his A-Class Shoot wrestler's rank and his BJJ black belt from Nakai.

KHK MMA: The Khalid Bin Hamad Al Khalifa Mixed Martial Arts (KHK MMA) is a martial arts organization based in Bahrain.  It was founded under the patronage of His Highness Khalid bin Hamad Al Khalifa for its current CEO and professional MMA fighter Mohammed "The Hawk" Shahid in February 2015.  Fighters competing under KHK MMA banner include: former UFC lightweight champion Frankie Edgar, UFC lightweight contender Khabib Nurmagomedov, UFC lightweight fighter Islam Makhachev, Bellator fighter James Gallagher, 2-time IMMAF champion Jose "Shorty" Torres, former UFC fighter and current Titan FC contender Alex Soto, and current Desert Force fighter Hamza Kooheji.  KHK MMA activities include: coaching pro fighters, developing amateur MMA, promoting martial arts events, fitness gyms, and a sports gear brand.

Adam Ondra: Adam Ondra (born February 5, 1993) is a Czech professional rock climber.  He specializes in lead climbing and bouldering and is the only athlete to have won the World Championships in two disciplines, lead and bouldering.  In addition, he won both medals in the same year, during the 2014 edition.  He also has a similar record in the World Cup, being the only athlete to have won the World Cup in two disciplines, lead in 2009 and bouldering in 2010.

Championship Fighting Alliance: Championship Fighting Alliance (CFA) is a mixed martial arts (MMA) based promotion company located in Miami Lakes, Florida.  It was founded by former MMA fighter and promoter Jorge De La Noval in 2011.  It has currently produced 10 live events.  Fallon Fox, who currently is signed to fight for CFA, is the first openly transgender MMA fighter in history.  On May 24, 2013, CFA will be hosting CFA 11, their 11th event at the Bankunited Center located on the University of Miami campus.  Fighter 411 reported that CFA had held the most events in Florida during the 2012-2013 season.

Melvin Manhoef: Melvin Manhoef (born 11 May 1976) is a Surinamese-born Dutch professional kickboxer and mixed martial artist.  In kickboxing, he is a former It's Showtime Champion, and in MMA he was the Cage Rage Light Heavyweight Champion.  In mixed martial arts, he is currently competing in Bellator's Middleweight division and has also formerly competed for Strikeforce, DREAM, RINGS, It's Showtime, K-1, ONE FC, and KSW.  As of 2 November 2015, he is ranked the #9 Middleweight in GLORY.  28 of his 30 wins have come via knockout, the highest percentage of any MMA fighter with at least 15 wins.

Skip Hall (MMA): J. "Skip" Hall is a former mixed martial artist and IBM sales manager.  At 57, "Skip" claimed to be the oldest pro-debuting fighter, and in 2008 at the age of 63 he gained a measure of notoriety as an unusually old combat sports athlete.  He was a participant in the Jasper City Slugfest in August 2006 against former UFC Superfight Champion Dan Severn, and retired in 2009 from active MMA fighting after declaring himself "Oldest Active MMA Fighter in history."

Chase Beebe: Chase Beebe (born March 29, 1985) is an American professional mixed martial artist from Chicago, Illinois.  He has recently fought for the World Extreme Cagefighting organization, where he was the Bantamweight Champion.  He lost that belt on February 13, 2008, to fellow Midwestern MMA fighter Miguel Torres.  Beebe trains at Gilbert Grappling in Country Club Hills, IL.

Supporting paragraphs: Masakatsu Ueda Yuki Nakai
Answer: shoot wrestling and jiu-jitsu