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 UFC 317 fight between Ilia Topuria and Charles Oliveira will be available through pay-per-view in the US on ESPN+. ESPN+ subscribers can opt to add it on to their monthly plan ( click here to see how ), and it's a $79.99 add-on to the monthly subscription.

Although Topuria has fought at lightweight in the past, this move up seemingly is a full commitment, and the differences in his frame could be spotted when he stepped on the scale at 155 pounds. There was a brief moment of confusion when the commission representative announced Topuria at 155.