BATON ROUGE, La. -- Jared Sam scored 19 points and grabbed 10 rebounds and Southern picked up its first conference win, beating Grambling 80-69 on Saturday.
Southern scored first and led all the way, building to a 39-21 advantage at intermission. But Grambling battled back in the second half, closing to 61-51 on a Drake Wilks 3-pointer with nine minutes left and to 74-69 on a pair of 3s by Shirmane Thomas with 59 seconds to go.
Sam and Umude combined for 6 of 6 free throws in the final seconds to secure the win for Southern.
Wilks led the Tigers (4-12, 0-3) with 18 points and five rebounds. Thomas finished with 15 points and Ivy Smith Jr. had 12.
Mannion, who recently reclassified and is ESPN's No.11 overall player in the class of 2019, chose Arizona over Marquette.
He'll fit in with Sean Miller's plans for a faster tempo on offense.
The cream of the crop of American high school basketball will congregate in Colorado Springs from Oct. 5-7, as USA Basketball unveils its newly expanded Junior National Team minicamp in collaboration with the NBA, NCAA and NBPA.