UFC Fight Night: Overeem vs. Oleinik was a mixed martial arts event produced by the Ultimate Fighting Championship held on April 20, 2019, at Yubileyny Sports Palace in Saint Petersburg, Russia.

Alexander Yevgenyevich Volkov is a Russian professional mixed martial artist. He currently competes in the Heavyweight division in the Ultimate Fighting Championship (UFC). A professional MMA competitor since 2009, Volkov previously competed for the M-1 Global promotion, as well as Bellator MMA. He is a former heavyweight champion in both promotions. As of May 14, 2024, he is #5 in the UFC heavyweight rankings.