Broekhoff had nine rebounds for the Crusaders (6-2).
Frank Gaines scored 19 points for the Mastodons (5-5), who shot just 31.4 percent from the floor, including 4 of 20 in the second half, which prevented them from staying in a game they trailed by three points at halftime.
Broekhoff scored six straight points to ignite a 10-2 second-half run that gave Valpo control. With the score 45-41, Broekhoff made a 3-pointer, drained a jumper and hit a free throw on consecutive possessions, and the Crusaders built a 55-43 lead with 5:33 remaining.
IPFW got no closer than nine the rest of the way.
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Forward Trevon Bluiett has withdrawn from consideration from the NBA draft and will return to Xavier for his junior season.