Mallett went 28-for-43 with an interception in his big night. Twelve of the completions went to Greg Childs, who finished with 146 yards and two scores for the Razorbacks (2-0).
The Arkansas signal-caller found Childs on an 11-yard pass to get the ball to the Warhawks' 22 yard line late in the third quarter, and six plays later took the ball into the end zone himself from a yard out for a 14-0 lead that sparked the Razorbacks to their victory.
Louisiana-Monroe (0-1) was led by Kolton Browning, who went 7-for-17 for 74 yards, one touchdown and an interception.
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