Question: Who was born first, Cheick Kongo or ALexander Volkov?

full_context: Document 1: Gadzhimurad Antigulov: Gadzhimurad Antigualov (Russian: Гаджимурад Антигулов ; born January 1, 1989) is a Russian mixed martial artist of Avar heritage who currently fights in Light Heavyweight division in the Ultimate Fighting Championship (UFC). He was the two times Light Heavyweight champion for Absolute Championship Berkut. He is currently the #15 ranked light heavyweight in UFC rankings as of 2 July 2017.
Document 2: Sebastien Konan: Sebastien N'Guessan Konan is a taekwondo athlete from Côte d'Ivoire. He started Taekwondo at a very young age. He is a two-time Olympic athlete. Sebastien Konan is the athlete who officially represented Côte d'Ivoire for the first time at the Olympic Games in Taekwondo when the sport became an olympic event in Sydney, Australia. Sebastien Konan has won many gold medals in national and international competitions. He was decorated 3 times with the Medal of Honor from the Ministry of Sport and the Chancellor. He was ambassador of the International Olympic Committee (IOC) as a scholarship bearer. He won the gold medal at the 1999 All-Africa Games in Taekwondo for the first time in Côte d'Ivoire and the gold medal at the 2006 US Taekwondo Open and US National. He is a 4 time gold medalist at the African Taekwondo Championships, a 2 time gold medalist at the World Francophonie Cup, a 15 time National Champion, and a gold medalist in many other international open tournaments.
Document 3: Oleksiy Oliynyk: Oleksiy Oleksiyovych Oliynyk (Ukrainian: Олексі́й Олексі́йович Олі́йник , born June 20, 1977; Russified to Alexey Alexeievich Oleinik, Russian: Алексей Алексеевич Олейник ) is a Ukrainian-Russian mixed martial artist, jujitsuka, combat sambist and grappler currently signed with the Ultimate Fighting Championship, competing in their heavyweight division. A professional competitor who began his career in 1997, he is a M-1 Global veteran and has fought for Bellator, KSW, BodogFIGHT, and YAMMA Pit Fighting. As of July 2017, he is #11 in the official UFC heavyweight rankings. He is the only fighter to win a UFC fight via Ezekiel choke and also holds the record for most Ezekiel choke wins in MMA competition, with ten.
Document 4: 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.
Document 5: Cheick Kongo: Cheick Guillaume Ouedraogo (born May 17, 1975), more commonly known as Cheick Kongo, is a French heavyweight mixed martial artist and former kickboxer who fights in Bellator MMA. He holds notable wins over the likes of Mirko Cro Cop, Lavar Johnson, Shawn Jordan, Matt Mitrione, Alexander Volkov and Pat Barry. As of June 19, 2017, he is #12 in the world rankings by Sherdog.
Document 6: Rodney Glunder: Rodney Glunder (born as "Rodney Faverus", March 1, 1975) is a Dutch-Surinamese semi-retired professional kickboxer, mixed martial artist, professional wrestler and boxer, current actor, entrepreneur, bodybuilder. He has fought for M-1 Global, Cage Rage, K-1, PRIDE Fighting Championship, RINGS, Glory, Konfrontacja Sztuk Walki, It's Showtime, SuperKombat, SLAMM!! Events and Art of War Fighting Championship. Glunder holds notable wins over top contenders Cheick Kongo, Valentijn Overeem, Joe Riggs, Melvin Manhoef, Cyrille Diabaté, Brian Douwes and Gregory Tony.
Document 7: Conor McGregor: Conor Anthony McGregor (Irish: "Conchúr Antóin Mac Gréagóir" ; born 14 July 1988) is an Irish professional mixed martial artist and professional boxer who is currently signed to the Ultimate Fighting Championship (UFC). He is the reigning UFC Lightweight Champion, and former UFC Featherweight Champion. During his mixed martial arts (MMA) career, McGregor has competed as a featherweight, lightweight, and welterweight. As of 2017, McGregor is ranked 2nd on UFC's pound for pound rankings.
Document 8: Silviu Vulc: Silviu Dorin Vulc more commonly known as Silviu Vulc is a Romanian heavyweight mixed martial artist. Silviu Vulc spent his early career boxing in Romania, he then moved to Russia to train with Red Devil Sport Club team mates with Fedor Emelianenko and Alexander Emelianenko. Vulc spent two years there training and fighting. During this time he had ten MMA fights with eight wins and three losses, the first seven fights being semi-professional before moving into the professional league. Vulc had a short professional career, defeating Rodrigo Mendes in the Desert Combat Challenge in Israel and losing twice. His last fight being in 2008 for M-1 Global. Silviu has spent most of his time and energy over the years coaching others in boxing and MMA around the world including time spent in Russia, Romania and London, England.
Document 9: Khabib Nurmagomedov: Khabib Abdulmanapovich Nurmagomedov (Russian: Хабиб Абдулманапович Нурмагомедов ; Avar: ХIабиб ГӀабдулманапил НурмухӀамадов ; born September 20, 1988) is an undefeated Russian mixed martial artist of Avar heritage. He is a two time Combat Sambo World Champion, a wrestler and a judo black belt who currently fights in the Lightweight division of the Ultimate Fighting Championship. He currently holds one of the longest undefeated streaks in MMA with 24 wins. As of 17 November 2016, he is ranked the #1 contender in the UFC Lightweight division and #12 in official UFC pound-for-pound rankings and numerous other publications.
Document 10: Alexander Volkov (fighter): Alexander Yevgenievich Volkov (Russian: Александр Евгеньевич Волков ; born October 24, 1988) is a Russian mixed martial artist who competes in the UFC heavyweight division. A professional MMA competitor since 2009, Volkov has competed almost exclusively for the M-1 Global promotion, as well as Bellator MMA. He is a former Heavyweight Champion in both promotions. He is currently ranked as the #7 contender in the official UFC rankings.
Document 11: Alexander Sarnavskiy: Alexander Sarnavskiy (born January 17, 1989) is an Ethnic Russian mixed martial artist who competes in the lightweight division. A professional MMA competitor since 2008, Sarnavskiy has mostly competed in his native Russia, where he is an M-1 Global veteran and former lightweight division in the Bellator Fighting Championships. Alexander is currently ranked as the #4 lightweight in Europe.
Document 12: Alexander Povetkin: Alexander Vladimirovich "Sasha" Povetkin ( ; Russian: Алекса́ндр Влади́мирович Пове́ткин ; born 2 September 1979) is a Russian professional boxer who held the WBA (Regular) heavyweight title from 2011 to 2013. As an amateur he won a gold medal in the super-heavyweight division at the 2004 Olympics, gold at the 2003 World Championships, and consecutive gold at the 2002 and 2004 European Championships. Povetkin is known as a physically strong, hard-hitting and skilled pressure fighter.
Document 13: Rick Cheek: Richard P. "Rick" Cheek (born October 4, 1977) is an American kickboxer and mixed martial artist who competes in the heavyweight division. A North American Muay Thai champion as an amateur, Cheek turned professional in 2005 and debuted in K-1 the same year. He holds notable wins over WSOF standout Dave Huckaba in MMA, 2001 K-1 Japan Grand Prix Champion Nicholas Pettas and multiple time world kickboxing champion Mike Sheppard
Document 14: Artem Vakhitov: Artem Olegovich Vakhitov (Russian: Артё́м Оле́гович Вахитов , "Artёm Olegovich Vahitov" ; born April 4, 1991) is a Russian Muay Thai kickboxer who competes in the cruiserweight and heavyweight divisions. Having begun practicing Muay Thai at eleven years old, Vakhitov first came to prominence due to a successful amateur career by winning four IFMA European and three world championships as well as taking silver at the World Combat Games in 2010 and gold in 2013. He turned professional in 2009, and signed with Glory in 2013 after becoming the WMC European Super Light Heavyweight Champion. He is currently ranked the #1 light heavyweight in the world by LiverKick.com, Combat Press and GLORY. Vakhitov is the current Glory Light Heavyweight Champion.
Document 15: Cung Le: Cung Le (Vietnamese: "Lê Cung" ; born May 25, 1972) is a Vietnamese-born American actor, retired mixed martial artist and Sanshou kickboxer. He competed as a middleweight in the Ultimate Fighting Championship (UFC), holding a record of 2–2 with the organization. In Sanshou, he is a former International Kickboxing Federation Light Heavyweight World Champion, having a professional Sanshou record of 16–0 before moving to mixed martial arts (Le also held a kickboxing record of 17–0). He defeated Frank Shamrock to become the second Strikeforce Middleweight Champion before vacating the title to further pursue his acting career. Le is perhaps best known in mixed martial arts for competing in Strikeforce, holding a record of 7–1 with the organization before its demise.
ground_truth: Cheick Kongo