Petersen's 1-yard touchdown run with 5:34 left in the first quarter capped a 9-play, 69-yard drive to give the Owls (2-3, 1-1 Conference USA) a 7-0 lead. Petersen, who finished with 32 yards rushing, also scored from 1 yard with 4:57 left in the third quarter to make it 28-3.
McHargue was 15 of 22 and rushed for 44 yards. He found Luke Willson for a 15-yard touchdown before halftime to extend the lead to 14-3. Tyler Smith rushed 14 times for 97 yards, and Willson had five catches for 58 yards to lead Rice.
Tannar Rehrer had 11 catches for 89 yards for the Tigers (1-5, 0-2).
Joey Counts scored on a 1-yard run on fourth-and-goal with 2 seconds left to give Montana a 38-35 victory over four-time defending FCS champion North Dakota State on Saturday.
Transfer Vernon Adams will be the starting quarterback when Oregon begins its season against Eastern Washington on Sept. 5.
Tim Beckman is threatening legal action after Illinois fired him as football coach Friday amid allegations of influencing medical decisions and pressuring players to play hurt.
LSU offensive coordinator Cam Cameron revealed in a post-practice news conference that he has been treated for prostate cancer but plans to coach this season.
The woman who accused former Baylor defensive end Sam Ukwuachu of raping her in 2013 has hired a Title IX law firm to represent her in potential civil litigation.
Arkansas tight end C.J. O'Grady has been arrested by Fayetteville police and charged with driving while intoxicated and being a minor in possession of alcohol.