Johnny Walker embarked on his professional mixed martial arts career in December 2013, quickly establishing himself as a formidable competitor. Competing primarily in Brazil, he accumulated an impressive record of ten wins and three losses, with all victories coming via stoppages, demonstrating his early dominance. Seeking to further his career, Walker moved to England in early 2018, where he secured three additional wins, a pivotal period in his development. His impressive track record and dynamic style earned him a coveted spot on Dana White’s Contender Series in August 2018.
There, Walker secured a decisive unanimous decision victory against Henrique da Silva, which immediately led to his signing with the Ultimate Fighting Championship (UFC). His highly anticipated UFC debut followed swiftly in November 2018 at UFC Fight Night 140, where he defeated Khalil Rountree Jr. by knockout in the first round, earning his first Performance of the Night bonus. Walker continued this explosive success into early 2019 with two more first-round knockout victories, dispatching Justin Ledet and Misha Cirkunov, each performance securing an additional Performance of the Night award.
Walker also secured a victory at UFC on ABC 4 against Anthony Smith in 2023, further solidifying his standing. Most recently, Walker achieved a significant technical knockout victory over Zhang Mingyang in August 2025 at UFC Fight Night 257, which earned him another Performance of the Night bonus. With his consistent highlight-reel finishes and formidable presence, Johnny Walker is currently ranked #12 in the UFC light heavyweight rankings as of August 26, 2025, continually showcasing the power and skill that makes him a standout talent.