In search of his first octagon win, Martin Day has agreed to step in as a short-notice replacement. Julio Arce has been forced out of UFC Fight Night 184, and Day (8-5 MMA, 0-3 UFC) is now expected to face Timur Valiev (16-2-1 MMA, 0-0-1 UFC) in a featherweight bout at next Saturday’s UFC Fight Night 184 , which streams live on ESPN+ from UFC Apex in Las Vegas. Two persons with knowledge of the booking told MMA Junkie on Saturday of the plans.