Shumenov moved to the United States and based himself in Las Vegas where he turned professional in March 2007. In his debut in
North Carolina, he defeated Walter Edwards with a
knockout (KO) in the first round. He followed this up with another two KO wins within four months. In March 2008, he returned to Kazakhstan to fight Donnell Wiggins for the vacant
WBC Asian and
WBA-
PABA interim light-heavyweight titles. Shumenov quickly dispatched the experienced Wiggins with a second-round KO and the next month beat former
US national Golden Gloves champion Lavell Finger in the first round to add the vacant
WBO Asia Pacific title to his WBA-PABA interim and WBC Asian titles. His most high-profile fight came in August 2008 when he faced former world champion
Montell Griffin in
Chimkent, Kazakhstan to defend his regional WBC and WBO titles. Shumenov was taken to the scorecards for the first time in his career but won the fight clearly, winning every round on all three judges cards. He was targeting a fight with then
WBO light-heavyweight champion Zsolt Erdei.
WBA light-heavyweight champion , 2010 On 15 August 2009 and with only eight professional bouts on his record, he received a shot at the
WBA light-heavyweight title when he took on the
Gabriel Campillo. The fight took place in Shumenov's home country of Kazakhstan and resulted in the first loss of his career when Campillo was declared the winner by
majority decision (MD). A rematch took place on 9 January 2010, with the result being reversed with Shumenov being declared the winner by what was considered an extremely controversial
split decision (SD). With this victory he became the quickest man ever to win a world title in the light-heavyweight division, beating the record of fifteen fights set by
Jeff Harding in 1989. Shumenov made the first defense of his title on 23 July 2010 when he won a
unanimous decision (UD) against the previously unbeaten Viacheslav Uzelkov. Shumenov then arranged to have a
unification fight with the then
WBO champion Jürgen Brähmer, with the fight scheduled to take place in Kazakhstan on 8 January 2011. However, days before the fight was due to take place, Brähmer left Kazakhstan and returned to Germany, citing illness as his reason for dropping out of the fight. In his place, former middleweight world champion
William Joppy stepped in at short notice, and was knocked out by Shumenov in the sixth round. He successfully defended his title in
Las Vegas on 29 July 2011 against former
Contender star
Danny Santiago and again on 2 June 2012 in Las Vegas against
Enrique Ornelas. Shumenov was promoted to
WBA (Super) champion and retained the WBA (Super) and IBA light-heavyweight titles against Tomáš Kovács on 14 December 2013.
Shumenov vs. Hopkins Shumenov fought
Bernard Hopkins in a unification bout on 19 April 2014, losing his WBA (Super) and IBA light-heavyweight titles. Shumenov lost the fight via split-decision, with the judges scoring the fight 116-111 and 116-111 for Hopkins, while the third had it 113-114 for Shumenov.
WBA cruiserweight champion and retirement Shumenov vs. Flores Shumenov defeated
BJ Flores by a UD for WBA interim
cruiserweight title at the Palms Casino Resort in Las Vegas on 25 July 2015 in a
Premier Boxing Champions bout broadcast live on
NBCSN. Flores pressed the action throughout the fight, serving as the aggressor for much of the night. Shumenov began ramping up his offense in round eight, throwing combinations and taking advantage of a tiring Flores. With ten seconds left to go in the fight, Flores landed a punishing right hand that sent Shumenov careening into the ropes. Flores didn’t have enough time to take advantage of the opportunity and inflict more damage on a suddenly vulnerable Shumenov, resulting in a UD victory for Shumenov.
Shumenov vs. Wright On 21 May, 2016, Shumenov fought Junior Anthony Wright for the vacant WBA cruiserweight title. Shumenov won the fight via a tenth-round TKO. In June 2017, Shumenov retired at the age of 33 because of an eye injury. This retirement would be short-lived, as he returned in July 2018 to win back the vacant WBA (Regular) cruiserweight title.
Shumenov vs. Altunkaya Shumenov won back the WBA against Hizni Altunkaya, who was ranked #3 at cruiserweight by the WBA. Shumenov won the fight convincingly, winning 90-79 on all three scorecards. ==Professional boxing record==