Former World Series of Fighting lightweight champion Justin Gaethje will make his Octagon debut in July against Michael Johnson.

The two will headline The Ultimate Fighter 25 Redemption Finale from Las Vegas.

Gaethje (17-0) held the WSOF title for three-plus years, including a win last December over Luiz Firmino. He also defeated the likes of Melvin Guillard, Nick Newell and Brian Foster during his run.

Johnson (17-11) is 1-3 in his last four overall after winning four straight. He was submitted by Khabib Nurmagomedov last November.

Below is the current fight card:

Lightweight: Michael Johnson vs. Justin Gaethje

The Ultimate Fighter: Redemption Final

Featherweight: Gray Maynard vs. Teruto Ishihara

Middleweight: Elias Theodorou vs. Brad Tavares

Light Heavyweight: Jared Cannonier vs. Steve Bosse

Light Heavyweight: Marcel Fortuna vs. Jordan Johnson

Lightweight: Marc Diakiese vs. Drakkar Klose

Female Bantamweight: Jessica Eye vs. Aspen Ladd

Strawweight: Angela Hill vs. Ashley Yoder

Middleweight: Ed Herman vs. C.B. Dollaway