Charles Oliveira extended his winning streak to seven after submitting Lee in front of an empty arena at UFC Brasilia.
On a show ordered to take place behind closed doors due to the Covid-19 outbreak that has devastated the sporting calendar, Oliveira secured a huge win on home soil after making his opponent tap in the third round via a guillotine choke.
The win sees Oliveira now tied for the most finishes in UFC history with 16, having forced the stoppage in each of his seven wins since defeat to Paul Felder in December 2017.
Earlier on the card, Gilbert Burns provided the knockout of the night, becoming the first man to stop Demian Maia in 25 fights after stunning the Brazilian legend midway through the opening round.
A clean left hook from Burns ended the contest between two Brazilian Jiu-Jitsu black belts.
Despite the cancellation of sporting events across the globe, UFC president Dana White has remained defiant, insisting the show will go on with the MMA promotion's next scheduled event in London on Saturday 21 March.
