Beamon, sidelined by injury much of last season, returned in full health for Saturday's season opener and added eight rebounds and three assists to his double-digit scoring. Emmy Andujar and Rhamel Brown scored 14 points each and Shane Richards had 13, including four 3-pointers.
La Salle forced the game into overtime with an 8-0 run capped by a Tyreek Duran 3-pointer to tie the game 73-73 at the end of regulation.
Manhattan, trailing at the end of the first OT period, forced a second OT when Brown hit a layup to tie the game 81-81 and then blocked a jumper at the buzzer. The Jaspers took the lead on Alvarado's 3-pointer with 2:53 remaining in the second overtime period and pulled away.
Malik Newman, who had widely been considered a one-and-done player, has chosen to transfer to Kansas to continue his college career.
Avery Johnson's first season as a college coach was a success by most measures, and he'll aim to keep the Crimson Tide rolling in the right direction.
Gonzaga has signed California transfer Jordan Mathews to a financial aid agreement for the 2016-17 season.