Eric Mosley chipped in 16 points and Conger added a game-high nine boards to help St. Bonaventure (13-13, 6-7 Atlantic 10 Conference) outrebound Duquesne 35-26.
After two free throws by Conger put the Bonnies ahead 75-68 with 32 seconds remaining, Jeremiah Jones connected on a 3-pointer with 28 seconds left to cut the lead to 75-71. But that was the last basket for the Dukes as they missed their final two attempts with less than 30 seconds to play.
Conger and Johnson combined to score 13 of the Bonnies' final 14 points.
St. Bonaventure shot 54 percent (27 of 50), compared to Duquesne's 39.3 percent (22 of 56).
Quevyn Winters had 18 points and seven rebounds for the Dukes (8-19, 1-12), who have lost three in a row.
Andy Katz breaks down the likelihood of Villanova, Syracuse, North Carolina or Oklahoma making a run to the Final Four next season.
Florida State has announced that Xavier Rathan-Mayes will return to the court for his junior season. The 6-foot-4 guard declared for the NBA draft last month but did not hire an agent.
Virginia coach Tony Bennett takes the ACC Fast Break with Dino Gaudio by answering questions like who the best Tony Bennett is and what other sport he'd like to coach.