Wintering was 11-of-15 shooting from the field for the Pilots (8-7, 2-0 West Coast Conference). Bryce Pressley made four 3-pointers and scored 15 points, and Jarrel Marshall added 10 points for the Pilots, who made 10 3-pointers.
Wintering hit a 3-pointer to give Portland a 35-23 lead with 4:47 left in the first half and then made three consecutive layups in the final 1:49 of the period for a 44-36 lead.
Pressley's 3-pointer midway through the second half sparked a 10-3 Portland run for a 70-52 advantage with 10:21 to play. Pepperdine closed to within six points, 72-66, with 6:18 remaining but Wintering kept the Pilots on top, scoring 11 of the team's final 15 points.
Jeremy Major led the Waves (7-6, 0-2) with 28 points on 10-of-16 shooting.