Alexey Alexeyevich Oleynik (born June 25, 1977, as Oleksíy Oleksíyovych Olíynyk) is a Ukrainian-born Russian mixed martial artist, combat sambist and jujitsuka currently signed with the Ultimate Fighting Championship, competing in their heavyweight division. He began his professional fighting career in 1997, and is a veteran of M-1 Global, ProFC and IAFC and has competed for Bellator, KSW and YAMMA Pit Fighting. He is the only fighter to win a UFC fight via Ezekiel choke, and has done so twice. Oleynik also holds the record for most Ezekiel choke wins in MMA competition, with twelve. As of December 10, 2019, he is #12 in the UFC heavyweight rankings.