San Francisco had a chance to cut a 68-62 deficit to three in the final minute, but Parker's 3-point attempt from the top of the key glanced off the side of the rim. Young secured the rebound, was fouled, and made two free throws to put Saint Mary's up 70-62.
The Gaels held on, thanks to their going 8 for 8 from the free-throw line in the final 45 seconds. They were 24 for 27 for the game.
Both teams shot well, with San Francisco hitting 26 of 51 (51 percent) from the floor and Saint Mary's 25 of 50 (50 percent).
Purdue coach Matt Painter says players haven't used the fifth-year graduate transfer rule for its true intent.
The dust has settled after players made their NBA draft decisions. Which college teams won? Which lost? Well, Villanova is pretty happy. USC, meanwhile, might not be as thrilled.
The 2017 recruiting class is short on point guards, with Trevon Duval leading only eight prospects from the ESPN 60 who are still available.