Former featherweight titleholder Topuria (16-0 MMA, 8-0 UFC) will take on former 155-pound kingpin Oliveira (35-10 MMA, 23-10 UFC) for the vacant strap left behind when Islam Makhachev agreed to move up to welterweight. There is history at stake for both sides, and the anticipated was palpable during their final encounter at ceremonial weigh-ins.

UFC 31 will showcase Ilia Topuria facing off against Charles Oliveira for the vacant UFC lightweight title on Saturday. Here is what to know.

The vacant UFC lightweight championship is up for grabs at UFC 317, with Ilia Topuria vs. Charles Oliveira, with the flyweight title on the line in the co-main.