Mama might have said knock you out, but she probably didn’t also warn you that ProbCause was coming for your jaw. For the Chicago emcee’s brand new video single, Flex, ProbCause steps inside the ring with a hard-rocking and heavy hitting beat from producer Wes P serving as his entrance music. It’s all the excuse the headliner needs to come out swinging, delivery deadly and quick rhyme combinations that remind me of Sugar Ray Leonard - you know, if Sugar Ray could rap really well. Flex can be found on ProdCause’s forthcoming Recipe EP, out Labor Day weekend, and if you can’t wait that long, The DJBooth is hooking you up with a free stream and download of his previous project, Stir Fry. You’re welcome.