The Eagles scored the game's final seven points to stun the 25th-ranked Pioneers.
UW-Platteville played a near-flawless first half, rolling to a 42-29 lead by shooting 55 percent from the field. The Eagles, however, held the Pioneers to eight baskets in the second period, enabling them to come back.
Brad Reitzner scored 15 points, and Mark Gossens had 14 for the Pioneers, who fell to 1-2. Charlie Averkamp led the Ealges (1-1) with 20 points.