It was the 11th consecutive loss for Duquesne (7-16, 0-9 Atlantic 10 Conference). The Musketeers are 13-9, 6-3.
Xavier, up 33-26 at halftime, got 15 points from Justin Martin and a double-double from Travis Taylor (13 points, 12 rebounds). The Musketeers never blew it open, not with Duquesne's Quevyn Winters scoring 19 points.
Winters' 8 for 20 shooting from the field included 3 of 12 3-pointers. Shooting beyond the arc killed Duquesne, which led 47-37 midway through the second half, then missed nine straight shots.
The Dukes were 9 of 33 on treys (27.3 percent). Jeremiah Jones (11 points) hit 3 of 5 3-pointers. Jerry Jones added 11 points.
Philmore, meanwhile, came off the Xavier bench for his 16 points. Justin Martin added 15 points. Christon also had eight assists and seven rebounds.
Mike Krzyzewski says he has good reason to be excited for next season thanks to a combination of Duke's incoming freshmen and a core of experienced upperclassmen.
Georgia guard Juwan Parker has been awarded a medical redshirt, leaving him with two years of eligibility, after missing the 2015-16 season with a partially torn Achilles tendon.
Forward Trevon Bluiett has withdrawn from consideration from the NBA draft and will return to Xavier for his junior season.