Background and career
Sergey Alexandrovich Kovalev (Kovalyov) (Russian: Сергей Александрович Ковалёв; born 2 April 1983) is a Russian former professional boxer who competed from 2009 to 2025. He held multiple light-heavyweight world championships, including the WBA (Undisputed) and IBF titles from 2014 to 2016, and the WBO title three times between 2013 and 2019. Nicknamed the "Krusher", Kovalev is particularly known for his exceptional punching power, although he describes himself as "just a regular boxer". In November 2019, Kovalev was ranked as the world's second-best light-heavyweight by The Ring magazine, third by BoxRec, and fourth by the Transnational Boxing Rankings Board. In 2014, The Ring named him its Fighter of the Year.
Kovalev was initially interested in ice hockey, but stopped playing after his equipment was stolen from a dressing room. Because his parents could not afford to purchase replacement equipment, he tried other sports. Several months after he stopped playing hockey, he began to practice both boxing and amateur wrestling.
Kovalev started boxing in 1994 at the age of 11 and made his amateur debut in the 1997 Russian Boxing Junior Championship, where he won a gold medal in the middleweight juniors division. One year later, he competed with the seniors and reached the finals, and won the final fight the year after. He competed in the European Championships for the Russian team. In 2004, Kovalev participated in the Russian Senior Championship for the first time, reached the finals, and won the gold medal in the team event. In 2005, he reached the peak of his amateur career and won two championships: the first as a champion of Russia and the second as a champion among servicemen. He won the silver medal in the championship for servicemen in 2006. In 2007, he finished third in both the Russian Championship and World Military Games in India. In 2008, Kovalev participated in his final amateur competition and reached the finals, after which he decided to turn professional. Kovalev admitted that he felt forced to leave the national team because of the intense competition between him and others boxers such as Artur Beterbiev (to whom he lost 24–25). Kovalev finished his amateur career with a record of 195–18.
2000 Russian Junior Championships silver medalist at light-welterweight 2001 Russian Junior Championships silver medalist at middleweight 2004 Russian Championships silver medalist at middleweight, losing to Matt Korobov 2005 Russian Championships gold medalist at middleweight 2005 World Military Championships gold medalist at light-heavyweight, in Pretoria, South Africa 2006 World Military Championships silver medalist at light-heavyweight, in Warendorf, Germany 2007 World Military Championships gold medalist at light-heavyweight, in Hyderabad, India 2007 Russian Championships bronze medalist at light-heavyweight, losing to Artur Beterbiev 2008 Russian Championships silver medalist at light-heavyweight.
Kovalev started his career with a first-round KO of Daniel Chavez at Greensboro Coliseum in Greensboro, North Carolina. In July 2011, Kovalev won his first North American Boxing Association belt in a 10-round fight with Douglas Otieno from Kenya. His next bout against Grover Young was controversial: during the second round, Kovalev threw a left hook that the referee declared an illegal blow to the back of the head. Due to Young's inability to continue, the fight was declared a technical draw. In his 2011 fight against Roman Simakov of Russia, Kovalev knocked down his opponent in the sixth round. The fight was stopped and Kovalev was awarded a TKO victory. Simakov was taken to the hospital, where he lapsed into a coma and died three days later. In 2012, John David Jackson became Kovalev's trainer. Kovalev met Darnell Boone in the ring for the second time and knocked him out in the second round; the win led him to be signed on to Main Events boxing. On 19 January 2013, Kovalev faced the former World Boxing Association (WBA) light-heavyweight champion Gabriel Campillo. Kovalev took advantage of Campillo's faltering defense and knocked him down with a left hook, one of three knockdowns in the round.
On 17 August 2013, Kovalev fought Nathan Cleverly for the World Boxing Organization (WBO) light-heavyweight title. Kovalev, who knocked most of his opponents out within three rounds, threw heavy shots in the first round, and hurt Cleverly badly in the third round, dropping him twice. Kovalev knocked Cleverly down a third time in the fourth round until the referee intervened; it was the first time Cleverly had been knocked down as a professional.
