UFC Fight Night: Werdum vs. Volkov (also known as UFC Fight Night 127) was a mixed martial arts event produced by the Ultimate Fighting Championship that was held on March 17, 2018, at The O2 Arena in London, England.

Fabrício Werdum is a Brazilian mixed martial artist and former UFC Heavyweight Champion who competes in the Heavyweight division. He is also a 4-time Brazilian jiu-jitsu world champion, a two-time Abu Dhabi Combat Club World Heavyweight Champion and a member of the ADCC Hall of Fame. He holds a black belt in Brazilian jiu-jitsu, Judo, and Muay Thai. Werdum has competed in PRIDE, the UFC, Strikeforce, and Jungle Fight. At the time of his departure from the UFC, Werdum was #14 in the UFC heavyweight rankings.