Ugba, a senior transfer forward from Grambling, made 17 of 21 shots and grabbed 11 rebounds for his fifth double-double with the Governors (10-8, 5-1 Ohio Valley), who came in having lost six straight road games but won at JSU for the first time since 2011.
Zach Glotta hit four 3-pointers and scored 20 points and Terry Taylor added 18 for Austin Peay, which shot 61 percent and made half of their 16 3-point attempts against the conference's best scoring defense.
Malcolm Drumwright made four 3-pointers scored 20 points for the Gamecocks (13-6, 4-2), the defending OVC Tournament champions, with Jason Burnell adding 14 points.
Ugba had 18 points in the first half when Austin Peay took a 48-25 lead.
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