Mchunu made his professional debut against Mzikayise Hlengwa on 28 July 2008 in Durban, South Africa.
After amassing a 3-0 record, Mchunu was booked to face Patrick Madzinga for the vacant South African cruiserweight title on 29 February 2008.
[3] After successfully beating Danie Venter by majority decision on 4 June 2011, Mchunu faced his first step-up in competition as he was booked to fight the 10-2 Zack Mwekassa on 24 October 2011, in Kempton Park, Gauteng.
[6] Mchunu made his United States debut against Eddie Chambers on 3 August 2013, as the fight took place at the Mohegan Sun Arena in Montville, Connecticut.
[14] After suffering the second professional loss of his career, Mchunu was scheduled to face Boniface Kabore for the vacant WBA interim Pan African cruiserweight title on 20 May 2016 at the Convention Centre in KwaZulu-Natal, South Africa.
Mchunu challenged the reigning WBO cruiserweight champion Oleksandr Usyk on the Bernard Hopkins vs. Joe Smith Jr. undercard on 17 December 2016.
[19] After he bounced back from his loss to Usyk, Mchunu was booked to challenge the WBC International and Continental Americas cruiserweight champion Constantin Bejenaru on 25 November 2017.
[21] Seven months later, Mchunu was booked to face Ričards Bolotņiks on 23 June 2018, in his return to South Africa, after losing both of his previous United States bouts.
Mchunu was next scheduled to fight Thomas Oosthuizen for the vacant African cruiserweight title on 1 November 2018.
[24] Mchunu faced the 36-fight veteran Willbeforce Shihepo on 20 October 2019, at the Time Square in Menlyn, South Africa.
[31] Mchunu is scheduled to make his second world title challenge against the reigning WBC cruiserweight champion Ilunga Makabu on January 29, 2022, at the Packard Music Hall in Warren, Ohio.
[35][36][37][38] Mchunu lost to Muslim Gadzhimagomedov by unanimous decision in a 10 round contest at the International Boxing Centre Luzhniki in Moscow, Russia, on 31 January 2025.