Question: What nationality is Gennady Golovkin's opponent from his title fight on October 17, 2015?

Context articles: Makoto Fuchigami
Ray Lampkin
Nilson Julio Tapia
Leavander Johnson
Gennady Golovkin vs. David Lemieux
Canelo Álvarez vs. Gennady Golovkin
Gaydarbek Gaydarbekov
David Lemieux (boxer)
Gennady Golovkin vs. Kell Brook
Milton Núñez (boxer)

Makoto Fuchigami (淵上 誠 , Fuchigami Makoto ) is a Japanese professional boxer.
 He has 23 wins, 11 losses, with 14 of those wins coming by way of knockout.
 He fights in the middleweight division.
 Fuchigami became the Japanese middleweight champion in 2010.
 On May 12, 2012, Fuchigami fought Gennady Golovkin for the WBA and IBO Middleweight championship of the world in Kiev, Ukraine.
 Fuchigami was defeated by TKO in the third round.
Ray Lampkin, Jr. (born 1948 in Portland, Oregon) is a retired professional boxer who lost the 1975 World Boxing Association (WBA) lightweight title fight against Roberto Durán in Panama.
 He won the North American Boxing Federation lightweight title fight but later lost it against Esteban de Jesús at the Felt Forum in New York City.
 He finished his career with a total of 34 wins (16 by knock out), six losses (two by knock out) and one draw.
 Lampkin was inducted into the Oregon Sports Hall of Fame.
Nilson Julio Tapia (born September 5, 1985) is a Colombian middleweight boxer.
 Nilson 's biggest fight was against Gennady Golovkin for the regular WBA middleweight title.
 In this title fight, Nilson lost by knockout in the third round.
Johnson made his debut as a professional boxer in 1989 following a successful amateur career, during which he fought in over 130 contests.
 As a professional he quickly built on his reputation as a top prospect by remaining undefeated after his first 22 contests (one of which was drawn).
 His next fight was against another highly rated youngster, Sharmba Mitchell (who was also undefeated as a professional).
 Johnson won the fight, earning himself his first world title shot, by knocking his opponent out in the eighth round.
 The world title fight came on August 6, 1994 against Miguel Ángel González for the WBC Lightweight crown.
 The fight, which was fought in Ciudad Juárez, Mexico, ended with Johnson suffering his first loss as a professional, the fight being stopped in the eighth round
Gennady Golovkin vs David Lemieux was a boxing title fight broadcast on HBO pay-per-view at Madison Square Garden on October 17, 2015.
Canelo Álvarez vs. Gennady Golovkin, billed as "Supremacy", was a professional boxing superfight contested for the unified WBA (Super), WBC, IBF, "Ring" magazine, and lineal middleweight championship.
 The bout was on September 16, 2017 at T-Mobile Arena on the Las Vegas Strip.
 It was televised on HBO pay-per-view in the United States, on BoxNation Box Office in the United Kingdom, and on Space in Latin America.
Gaydarbek Abdulovich Gaydarbekov (Russian: Гайдарбек Абдулович Гайдарбеков ) (born October 6, 1976 in Kaspiysk, USSR) is a Russian boxer of Avar heritage, who has won one Olympic medal in Middleweight including the gold medal at the 2004 games.
 He qualified for the Athens Olympics by winning the 2004 European Amateur Boxing Championships in Pula, Croatia.
 Today he is perhaps best known for defeating future boxing superstar Gennady Golovkin in the 2004 Olympic finals.
 Despite his brilliant amateur pedigree, he never turned professional.
David Lemieux (born December 22, 1988) is a Canadian professional boxer who held the IBF middleweight title in 2015.
Gennady Golovkin vs. Kell Brook was a professional boxing match for the unified WBC, IBF, and IBO middleweight titles.
 The bout was held on September 10, 2016, at the O2 Arena in London, England.
 The event was televised live on Sky Sports Box Office in the UK and HBO in the United States.
 Golovkin won the fight in round 5, after Brook's corner threw in the towel.
Milton Núñez (born September 25, 1987) is a Colombian middleweight boxer.
 Nunez's biggest fight was against Gennady Golovkin for the interim WBA middleweight title.
 In this title fight, Milton lost by knockout in 58 seconds.