In the main event, former featherweight champion Ilia Topuria makes the move to lightweight, where he'll take on former champ Charles Oliveira for the vacant title. Topuria vacated his featherweight title to pursue lightweight glory and he will enter the Octagon as a considerable favorite against Oliveira.

In a 5-round lightweight title bout in the main event, Ilia Topuria and Charles Oliveira meet Saturday at UFC 317 at T-Mobile Arena in Las Vegas.

Ilia Topuria and Charles Oliveira enter the octagon for an epic battle at UFC 317. Here is the expected ring walk time for the main event bout.