UFC Fight Night: Lee vs. Oliveira (also known as UFC Fight Night 170 and UFC on ESPN+ 28) is an upcoming mixed martial arts event produced by the Ultimate Fighting Championship that is planned to take place on March 14, 2020 at Ginásio Nilson Nelson in Brasília, Brazil.
A lightweight bout between former interim UFC Lightweight Championship challenger Kevin Lee and Charles Oliveira has been slated to serve as the event headliner.
A middleweight bout between Brad Tavares and The Ultimate Fighter: Brazil 3 heavyweight winner Antônio Carlos Júnior was scheduled for the event. However, Tavares was forced to pull out of the fight due to an anterior cruciate ligament (ACL) injury. He was replaced by Makhmud Muradov. In turn, Júnior suffered from an unspecified injury and the bout was cancelled from the event.
A women's strawweight bout between Paige VanZant and Amanda Ribas was scheduled for the event. However, VanZant was forced to pull out of the fight due to an undisclosed injury. VanZant requested to reschedule the bout one month later, but Ribas decided to remain at the event and Randa Markos stepped in as the replacement.
A flyweight between Su Mudaerji and Bruno Gustavo da Silva was scheduled at the event. However, due to 2019–20 coronavirus pandemic, Mudaerji was forced to withdraw from the event as he would not travel to prepare for the fight and was replaced by promotional newcomer David Dvořák.
On March 12, the UFC announced that this event would take place “behind closed doors” after the governor of the Federal District (where Brasília is located), Ibaneis Rocha announced that large gatherings will be suspended or closed for a period of 5 days due to the 2019–20 coronavirus pandemic. The UFC's planned Thursday media day and Friday ceremonial weigh-ins event have been canceled ahead of the event. The official early-morning weigh-ins Friday are the only official fighter obligations to remain ahead of fight night.