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.
Maryland point guard Melo Trimble, considered a lock to leave the program before struggling in the second half last season, has withdrawn from the NBA draft and will return for his junior season.
Louisville's Chinanu Onuaku, who recently underwent a medical procedure to correct a heart rhythm issue detected during the combine, will keep his name in the NBA draft pool.
Andrew White III will return to the Nebraska men's basketball team next season after removing his name from the NBA draft.