The Prairie Wolves built an early 21-9 advantage and maintained that double-digit lead the rest of the half en route to a 45-35 halftime lead.
BVU stayed within striking distance throughout the entire second half, but NWU had an answer each time the Beavers began making any charge. The lead crept into single digits several times over the final 20 minutes with a three-pointer from Sievers pulling BVU as close as 66-61 with under nine minutes yet to play.
The Prairie Wolves, however, came back with four quick points to push the margin back to nine at 70-61, and the Beavers were unable to claw any closer than eight points down the stretch.
Peter Lash led Nebraska Wesleyan (15-2, 6-2 A-R-C) with a game-high 23 points, including 5-of-9 shooting from downtown while Jack Groeteke added a double-double with 18 points and 13 rebounds. NWU has the league's second-longest win streak at 10 games.
Buena Vista dips to 10-7 overall (3-5 A-R-C) and returns home to host league-leading Coe College (15-2, 7-1 A-R-C) at 4 p.m.