Sean O'Connell (born September 2, 1983) is a retired American professional mixed martial artist who previously competed in the Light Heavyweight division of the Ultimate Fighting Championship.
 A professional competitor since 2007, O'Connell has formerly competed for the Maximum Fighting Championship.
Luke Zachrich (born October 1, 1981) is an American mixed martial artist and former professional boxer who formerly competed in the Middleweight division of the Ultimate Fighting Championship A professional mixed martial arts competitor since 2006, Zachrich was a member of Team Forrest on the seventh season of The Ultimate Fighter, and has also fought for King of the Cage, Xtreme Fighting Organization, Bellator, and Ultimate Victory Challenge, the latter of which he was the inaugural Middleweight Champion.
Matt Hume (born July 14, 1966) is an American mixed martial artist.
 He is the founder and head trainer at AMC Pankration in Kirkland, WA, which is home to UFC flyweight champion Demetrious Johnson, ONE bantamweight champion Bibiano Fernandes and he has trained numerous world class fighters including Josh Barnett, Tim Boetsch Bob Sapp, Chris Leben, Hayato Sakurai, Akira Shoji, Matt Brown, Rich Franklin, Mario Miranda and Caros Fodor.
Alex Morono (born August 16, 1990) is an American professional mixed martial artist who currently fights as a Welterweight in the Ultimate Fighting Championship.
 A professional competitor since 2010, Morono has also fought for Legacy Fighting Championship.
Daniel Jeffery Henderson (born August 24, 1970) is an American former mixed martial artist and Olympic wrestler, who last competed as a middleweight in the Ultimate Fighting Championship.
 He was the last Strikeforce Light Heavyweight Champion and was the last Welterweight (80 kg ) and Middleweight (95 kg ) champion of Pride Fighting Championships.
 Additionally, Henderson was the Brazil Open '97 Tournament Champion, the UFC 17 Middleweight Tournament Champion, the Rings: King of Kings 1999 Tournament Champion and the Pride Weltwerweight Grand Prix Tournament Champion.
 During his career, Henderson also challenged for the UFC Middleweight Championship (2x), the UFC Light Heavyweight Championship and the Strikeforce Middleweight Championship.
 He was the first mixed martial artist to concurrently hold two titles in two different weight classes in a major MMA promotion.
 At the time of his retirement after UFC 204, he was the oldest fighter on the UFC roster.
 Known to be one of the greatest mixed martial artists of all time having defeated a total of seventeen MMA world champions across four major MMA promotions (UFC, PRIDE FC, Strikeforce, and RINGS).
Jay Dee "B.J." Penn (born December 13, 1978) is an American professional mixed martial artist and Brazilian Jiu-Jitsu practitioner.
 Penn debuted and competed in the Ultimate Fighting Championship (UFC), and later in K-1.
 Prior to fighting for the UFC, he became the first American Gold medalist of the World Jiu-Jitsu Championship.
 In mixed martial arts, Penn has competed in the Featherweight, Lightweight, Welterweight, and Middleweight divisions.
 As a former UFC Lightweight Champion and UFC Welterweight Champion, he is one of only three fighters in UFC history to win titles in multiple weight classes.
 Penn was also a Co-champion in the UFC 41 Lightweight Tournament, due to an eventual draw opposite Caol Uno in the tournament finale.
 Through his tenures as champion, Penn unofficially unified the UFC Lightweight Championship (against Sean Sherk) and broke the all-time lightweight title defense record.
 Penn was inducted into the UFC Hall of Fame, as the inaugural inductee in the Modern-Era Wing by career-long rival Matt Hughes, during "International Fight Week" in July 2015.
Timothy A. Boetsch ( ; born January 28, 1981) is an American professional mixed martial artist currently fighting in the Middleweight division of the Ultimate Fighting Championship.
 In addition to the UFC, Boetsch has formerly competed as an alternate for the New York Pitbulls in the International Fight League and King of the Cage.
 He holds victories over former UFC Champion Johny Hendricks and former bellator middleweight champion Hector Lombard.
 As of July 21, 2017, he is ranked #13 in official UFC Middleweight rankings.
Matthew John Serra (born June 2, 1974) is an American former professional mixed martial artist, Brazilian Jiu-Jitsu practitioner who competed for the Ultimate Fighting Championship and stand up comic.
 He currently serves as a UFC on FOX analyst.
 Serra defeated Pete Spratt, Shonie Carter and Chris Lytle en route to becoming The Ultimate Fighter 4 Welterweight Tournament Winner.
 He captured the UFC Welterweight Championship immediately after, becoming the first of only four to win both accolades (along with Forrest Griffin, Rashad Evans, Michael Bisping).
 Serra also served as the head coach for "The Ultimate Fighter 6" reality show opposite Matt Hughes.
 In Brazilian Jiu-Jitsu, Serra holds a Silver Medal in the ADCC Submission Wrestling World Championship.
While mixed martial arts is primarily a male dominated sport, it does have female athletes.
 Female competition in Japan includes promotions such as DEEP Jewels.
 Now defunct promotions that featured female fighters were Valkyrie, and Smackgirl.
 Professional mixed martial arts organizations in the United States that invite women to compete are industry leader Ultimate Fighting Championship, the all female Invicta Fighting Championships, Resurrection Fighting Alliance, Bellator Fighting Championships, and Legacy Fighting Championship.
 Now defunct promotions that featured female fighters were Strikeforce and EliteXC.
Miesha Theresa Tate ( ; born August 18, 1986) is an American Mixed Martial Arts Pundit and former mixed martial artist who competed in the Ultimate Fighting Championship (UFC) and is a former UFC Women's Bantamweight Champion.
 Primarily known for her grappling ability, Tate became a wrestler while attending Franklin Pierce High School in Tacoma, Washington and won a state championship during her senior year in 2005.
 She began her professional mixed martial arts (MMA) career in 2007, and won the bantamweight championship of the Freestyle Cage Fighting promotion in 2009.
 Tate gained increased recognition in 2011, when she won the Strikeforce Women's Bantamweight Championship.
 She has also won a silver medal in the FILA Grappling Championships.

Question: Which ranking in the Ultimate Fighting Championship does this American professional mixed martial artist hold who was trained by Matt Hume?
Answer: #13