The Blue Devils fell to host Central Decatur of Leon to fall to 4-3 overall and 1-2 in Class A District 8 play with two district games remaining.
Martensdale will host Wayne of Corydon this week.
Central Decatur won handily, 44-14.
Blue Devil QB William Amfahr threw for 246 yards and two touchdowns and got picked once.
Amfahr connected with Dominick DiCesare on a 61-yard pass while Carson Elbert pulled down and eight-yard pass to complete the Martensdale scoring.
Central Decatur has a bye week while winless (0-7) Lynnville-Sully will be at New Sharon to take on winless (0-7) North Mahaska.