He was the inaugural M-1 Global Light Heavyweight World Champion and also fought for Bellator MMA and Absolute Championship Akhmat.

[citation needed] Vasilevsky made his debut with a first-round submission victory over Ladislav Zak via rear naked choke.

[7] Vasilevsky's road to the 2010 M-1 Global Light Heavyweight Championship started with a split decision victory over Sergey Guzev.

[8][9] Two other bouts in the selection – against Xavier Foupa-Pokam[10] and Shamil Tinagadjiev[11] went into the third round,[2] though he also achieved a first-round victory over Alihan Magomedov.

[13] Vyacheslav Vasilevsky defeated Tomasz Narkun via second-round TKO at M-1 Challenge XXII to become the inaugural M-1 Global Light Heavyweight Champion.

[2] Vasilevsky was expected to face Doug Marshall in the Bellator Season Eight Middleweight tournament before being replaced by Andreas Spang.

Vasilevsky returned to M-1 four months later to replace the injured Ramazan Emeev against Alexander Shlemenko in a rematch on June 16, 2016 at M-1 Challenge 64.