Alas was unstoppable on the attack all game, taking a breather for only a minute, and also dished out six assists for the Knights, who hiked their record to 7-6.
Raymond Almazan added 15 points for Letran, which also pushed the Pirates to an eight-game slide for a 2-11 slate.
Meanwhile, Arellano stunned Mapua, 59-57, on a game-winner by John Pinto with 2.7 seconds left on the clock to forge a 5-8 logjam.
Pinto had eight markers for the Chiefs while James Forrester paced the squad with 19 points.
Josan Nimes and Mike Parala combined for 13 points for the Cardinals on a losing effort.