McKinnon ran for 141 yards, including a 1-yard touchdown in the third overtime. During Chattanooga's third-overtime turn, Mocs quarterback Jacob Huesman was stoned on fourth-and-2 from the 5 to end the game.
Each team scored touchdowns in the first overtime, including an 8-yard, fourth-down scoring completion from Huesman to Faysal Shafaat to keep Chattanooga (4-4, 3-2) alive.
In the second overtime, Nick Pollard missed a 41-yard field goal attempt for Chattanooga, but McKinnon lost a fumble on the first play of the ensuing drive.
Alex Hanks missed wide right on a 49-yard field goal try for Georgia Southern (7-1, 6-1) at the regulation buzzer.
Huesman finished with 170 yards rushing on 26 attempts.
SOUTH CAROLINA STATE 41, HOWARD 23
In Orangeburg, S.C., Richard Cue threw four touchdown passes – the last a 97-yarder – to four different receivers as South Carolina State (4-5, 3-3) beat Howard (5-3, 4-2) in a Mid-Eastern Athletic Conference game.
Cue, who completed 24 of 38 passes for 366 yards, threw his first touchdown pass, a 14-yarder, to Dwight Brannon in the first quarter. He struck twice in the second quarter, hitting Lennel Elmore for a 40-yard score and Caleb Davis on a 20-yarder for a 27-10 halftime lead.
Cue saved his best for last: a 97-yard scoring pass in the fourth quarter to Tyler McDonald.
APPALACHIAN STATE 38, WESTERN CAROLINA 27
In Cullowhee, N.C., Logan Hallock completed the first 20 passes of his collegiate career, passing for two touchdowns as Appalachian State(6-3, 4-2) beat Western Carolina (1-8, 0-7) in a Southern Conference game.
FURMAN 31, ELON 17
In Elon, N.C., Jerodis Williams rushed for two scores and 104 yards, helping Furman (3-6, 2-4) ease past Elon (3-5, 1-4) in Southern Conference play.
WOFFORD 24, THE CITADEL 21
In Spartanburg, S.C. , Eric Breitenstein rushed for 110 yards and two touchdowns to help Wofford (7-1, 5-1) beat The Citadel (4-4, 3-3) in a Southern Conference game.
COASTAL CAROLINA 36, LIBERTY 12
In Conway, S.C., LaDarius Hawthorne intercepted a pass and returned it 66 yards for a score and Coastal Carolina put away Liberty with 21 second-half points.
Coastal Carolina quarterback and former Strom Thurmond star Aramis Hillary, who had accounted for 87 yards rushing and 113 passing, was carted off the field because of an injury with 7:51 left in the game.
JAMES MADISON 28, GEORGIA STATE 21
In Harrisonburg, Va., Dae’Quan Scott rushed for 130 yards to surpass 2,000 for his career and James Madison (6-2, 4-1 Colonial Athletic Association) topped Georgia State (1-8, 1-5).
STONY BROOK 56, PRESBYTERIAN 17
In Clinton, S.C., Miguel Maysonet and Marcus Coker combined for 356 of Stony Brook’s 416 rushing yards as the Seawolves (8-1, 4-0 Big South) blew out Presbyterian (2-7, 0-4).