Aleksei Oleinik

UFC 249: Ferguson vs. Gaethje was a mixed martial arts event produced by the Ultimate Fighting Championship that took place on May 9, 2020 at VyStar Veterans Memorial Arena in Jacksonville, Florida, United States.

UFC Fight Night 174: Lewis vs. Oleinik (also known as UFC Fight Night 174, UFC on ESPN+ 32 and UFC Vegas 6) was a mixed martial arts event produced by the Ultimate Fighting Championship on August 8, 2020 at the UFC APEX facility in Las Vegas, Nevada, United States. Derrick Lewis vs. Aleksei Oleinik; Heavyweight. Omari Akhmedov vs. Chris Weidman; Middleweight. Maki Pitolo vs. Darren Stewart; Middleweight. Yana Kunitskaya vs. Ketlen Vieira; Women's bantamweight. Beneil Dariush vs. Scott Holtzman; Lightweight.

UFC Fight Night 44: Swanson vs. Stephens was a mixed martial arts event held at the AT&T Center in San Antonio, Texas. The event was headlined by a featherweight bout between Cub Swanson and Jeremy Stephens.

UFC on ESPN 25: The Korean Zombie vs. Ige was a mixed martial arts event produced by the Ultimate Fighting Championship that took place on June 19, 2021 at the UFC Apex facility in Enterprise, Nevada, part of the Las Vegas Metropolitan Area, United States. A featherweight bout between former UFC Featherweight Championship challenger Chan Sung Jung and Dan Ige served as the event headliner.

UFC Fight Night 149: 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. A heavyweight bout between the 2010 K-1 World Grand Prix Champion and former Strikeforce Heavyweight Champion Alistair Overeem and Aleksei Oleinik served as the event headliner.

UFC Fight Night 91: McDonald vs. Lineker was a mixed martial arts event held on July 13, 2016 at Denny Sanford Premier Center in Sioux Falls, South Dakota.

UFC Fight Night 136: Hunt vs. Oleinik was a mixed martial arts event produced by the Ultimate Fighting Championship held on September 15, 2018 at Olimpiyskiy Stadium in Moscow, Russia. The event marked the promotion's first visit to Russia. The UFC arranged to use half of the venue and used a modified seating configuration for the arena. While not officially announced, the promotion was initially targeting a heavyweight bout between former UFC Heavyweight Champion Fabrício Werdum and Aleksei Oleinik to serve as the main event. However, on May 22, Werdum was flagged for a potential USADA doping violation and his status moving forward became unknown. On July 19, the promotion announced that a bout between the 2001 K-1 World Grand Prix winner and former interim title challenger Mark Hunt and Oleinik would serve as the event headliner.

UFC Fight Night 103: Rodríguez vs. Penn was a mixed martial arts event produced by the Ultimate Fighting Championship held on January 15, 2017, at Talking Stick Resort Arena in Phoenix, Arizona. A featherweight bout between The Ultimate Fighter: Latin America featherweight winner Yair Rodríguez and former UFC Lightweight and Welterweight Champion B.J. Penn served as the event headliner. This was Penn's first fight in the organization in over two-and-a-half years.