HOUSTON -- Ivy Smith Jr. had 22 points and seven rebounds on Monday night to help Grambling beat Texas Southern 78-55 for its 10th straight win.
Grambling (14-12, 10-3 Southwest Athletic Conference) took sole possession of first in the conference standings with Arkansas-Pine Bluff (9-4) dropping out after an 84-52 loss to Alcorn State on Monday night.
Texas Southern had a 17-6 run to cut the deficit to 54-45 in the second half but got no closer. Grambling pulled away with nine straight points and led by no less than 15 from there.
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.