At Pittsfield, Gabe Smith scored two first-half goals to lead the Black Raiders.
David Grant broke a scoreless tie 10 minutes into the first half off of an assist from Connor Wildes. Ryan King added a goal late in the second half and Taylor Roy added an assist.
Goalkeeper Alex Berard recorded his second consecutive shutout for Winslow.
Winslow improves to 4-0-2 and MCI falls to 1-3-1.