A lightweight bout between Danny Castillo (16-6 MMA, 6-3 UFC) and Isaac Vallie-Flagg (14-4-1 MMA, 1-1 UFC) is the latest addition to the UFC 172 lineup.

UFC officials today announced the bout.

UFC 172 takes place April 26 at Baltimore Arena in Maryland. The main card airs on pay-per-view following prelims on FOX Sports 1 and UFC Fight Pass.

Castillo vs. Vallie-Flagg will likely be part of the prelims.

Castillo was on a 5-1 run in the UFC before a majority-decision loss to Edson Barboza at UFC on FOX 9. Nearly every major media outlet scored the bout, which earned “Fight of the Night” honors, a 28-28 draw after Castillo scored a 10-8 first round. The WEC vet had defeated the likes of Anthony Njokuani, Paul Sass and Tim Means before the setback.

Vallie-Flagg, meanwhile, also recently had some momentum halted by a loss. The Strikeforce vet was on an 11-0-1 run, which included a UFC-debut split-decision victory over Yves Edwards, before a decision defeat to Elias Silverio at UFC Fight Night 35.

The latest UFC 172 card now includes:

Champ Jon Jones vs. Glover Teixeira – for light-heavyweight title

Phil Davis vs. Anthony Johnson

Jake Ellenberger vs. Tarec Saffiedine

Tim Boetsch vs. Luke Rockhold

Joseph Benavidez vs. Timothy Elliott

Bobby Green vs. Jim Miller

Joe Ellenberger vs. Yancy Medeiros

Andre Fili vs. Max Holloway

Danny Castillo vs. Isaac Vallie-Flagg

Bethe Correia vs. Jessamyn Duke

For the latest on UFC 172, stay tuned to the UFC Rumors section of the site.