[1] On June 24, 2016 Petrov challenged Cédric Tousch for his WAKO Pro K-1 World Light Heavyweight title at the Monte-Carlo Fighting Masters.
[2][3] On August 2, 2017, Petrov faced Jordan Yankov for the Max Fight Middleweight title.
[4] On October 13, 2017, Petrov faced Bojan Gajic at the B1B Fight Night in Varna, Bulgaria for the vacant WKN K-1 European Light Heavyweight title.
[6] On May 18, 2018, Petrov travelled to France to challenge Elijah Bokeli for the vacant WAKO Pro K-1 World Light Heavyweight title.
[8] Petrov faced Mike Sprangh on February 9, 2019 at the SFC 7 Avatars event in Sofia, Bulgaria.
[11] Petrov was scheduled to face Maxim Zaplitnî on July 2, 2021, at Max Fight 45 for the 84kg title of the promotion in a bout competed with open finger gloves.
He made his debut for the promotion on October 7, 2023, at Glory 89 in Varna, Bulgaria against Karim Mabrouk.