AUBURN, Ala.—After little Michael Smith ran the biggest run of his life, Arkansas mustered both it biggest goal line stand and a game-clinching interception to reward coach Bobby Petrino his first SEC victory as a Razorback.

The Razorbacks, 3-3, 1-2 upset 20th-ranked Auburn, 25-22, dropping the Tigers to 3-3, 2-3 before a stunned, 85,782 in Saturday’s SEC West game at Auburn’s Jordan-Hare Stadium.

Smith’s tackle-escaping 63-yard touchdown run with 8:50 left gave Arkansas a 25-20 lead, the Hogs’ only lead other than the 3-0 lead when Shay Haddock’s 27-yard field goal net...

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