Texas Southern (10-19, 10-6 Southwestern Conference) is in a three-way tie with Prairie View A&M and Southern for third in the standings, a half-game behind Arkansas-Pine Bluff and full game behind Grambling State.
Bruce, who hit nine 3-pointers and finished with 35 points in Saturday's win over Alabama A&M, scored a career-high 37 with eight 3s two days later while Jefferson tied his career best with 34 points. Jefferson, a sophomore, has scored at least 20 points in 12 of his 20 games this season.
Bruce and Jefferson hit back-to-back 3s to give TSU the lead for good at 18-12 and the Tigers scored the last nine points of the first half to make it 46-29. Alabama State trailed by double figures the rest of the way.
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.