The Mastodons rolled out to a 28-10 lead in the first half as Luis Jacobo sank two 3-pointers, coasting to a 32-20 halftime lead.
South Dakota opened the second half with a 25-9 surge to take a four-point lead near the midway mark. IPFW responded as Evans drained two 3-pointers and Jacobo had a three-point play to take a 57-48 advantage with 6:38 remaining.
The Coyotes pulled within three, but IPFW responded again with two baskets and a pair of free throws.
IPFW (19-8, 7-3 Summit League) outrebounded South Dakota 41-32. Jacobo finished with 15 points and Joe Edwards had 14.