Devin Oliver had 10 points and 12 rebounds for the Flyers (4-1), his first double-double.
After trailing 33-28 at the half, Andujar gave the Jaspers a 47-46 lead on a 3-pointer with 7:26 to go, and Beamon's jumper extended it to 51-48 at 5:55.
Dillard's 3-pointer at the 4:23 mark -- he scored seven points down the stretch -- put the Flyers ahead 54-51 at 4:23, and Dayton hit 8 of 10 free throws to seal it.
Manhattan trailed by as many as 11 in the first half but closed 28-27 on Donovan Kates' 3-pointer. Dillard's 3-pointer gave Dayton the 33-28 advantage at the break.
High school junior Zach Brown, a 7-footer from Miami, has rescinded his commitment to UConn, sources told ESPN.
Reserve center Akolda Manyang has been charged with felony aggravated assault after being accused of punching a man in the face without provocation.
Should the 76ers take Ben Simmons No. 1? What if they get the Lakers' pick, too? And how does the rest of the top 10 shake out? Our Insiders run their latest mock draft, with Philly on the clock.