Bellator 178: Straus vs. Pitbull 4 took place on April 21, 2017 at Mohegan Sun Arena in Uncasville, Connecticut . The event aired live on Spike TV. Bellator returned to Mohegan Sun with a Featherweight world title fight pitting Daniel Straus against Patricio "Pitbull" Freire as the main event of Bellator 178. Straus and Freire have fought three times before; Freire won one by submission and once by decision, while Straus most recently won by decision. A middleweight bout between Ed Ruth and Aaron Goodwine was originally scheduled for this card, but failed to materialize. Ruth instead faced David Mundell.
| Actor | Role |
|---|---|
 Patricio FreireSelf | Self |
| DDaniel StrausSelf | Self |
 Ilima-Lei MacfarlaneSelf | Self |
| JJessica MiddletonSelf | Self |
 Saad AwadSelf | Self |
| RRyan QuinnSelf | Self |
 A.J. McKeeSelf | Self |
| DDominic MazzottaSelf | Self |
| RRemo CardarelliSelf | Self |
| JJohn LopezSelf | Self |
| KKastriot XhemaSelf | Self |
 Nick AlleySelf | Self |
| BBlair TugmanSelf | Self |
| TTom EnglishSelf | Self |
 Jordan YoungSelf | Self |
| TTim CaronSelf | Self |
| EEd RuthSelf | Self |
| DDavid MundellSelf | Self |
 Tyrell FortuneSelf | Self |
| BBranko BusickSelf | Self |
| CChris FosterSelf | Self |
| SShane ManleySelf | Self |
 Don ShainisSelf | Self |
| MMak KelleherSelf | Self |
| RRegivaldo CarvalhoSelf | Self |
 Jay PerrinSelf | Self |
| KKemran LachinovSelf | Self |
| SSam WatfordSelf | Self |