The Tigers (10-7, 3-0), tied atop the Ivy League standings with Harvard, won their fifth straight game.
Princeton won it from beyond the 3-point arc and at the foul line. Bray was 3 of 3 on 3-pointers. Will Barrett (10 points) and Mack Darrow were each 2 for 3 from long range. The Tigers finished 8 for 11 on treys. Columbia (9-9, 1-3) was 4 of 13.
The score was tied 50-50 midway through the second half. But Hummer, who scored 16 points, was 12 of 14 from the free throw line -- including 7 of 8 in the last 4:28. After Columbia cut it to 69-66, Hummer hit 3 of 4 foul shots in the last 0:08 to ice it.
Maodo Lo led Columbia with 16 points.
With his floor general gone to the NBA, Kentucky coach John Calipari is using this offseason to improve his physical condition.
Chattanooga men's basketball coach Matt McCall has received a two-year contract extension after leading the Mocs to an NCAA tournament appearance in his debut season.
North Carolina men's basketball coach Roy Williams joins Seth Greenberg for Fast Break to discuss his favorite pregame meal, how he picks his game-day outfit and what CDs (gasp!) he has in his car.