First-half goals from Williams, Green and Pollock saw the Mariners secure a 3-0 win in their first pre-season fixture of the campaign.
Williams’ unstoppable free-kick gave Town the lead after just five minutes, before a mix up in the Owls’ defence saw Matt Green finish to double the advantage.
And then Matty Pollock sealed the win from a corner, slamming the ball home from inside the box.
Starting XI: McKeown, Hewitt, Waterfall, Pollock, Hope, Trialist, Clifton, Williams, Starbuck, Wright, Green.
Subs: Russell, Gibson, Painter, Jackson Jr, Trialist, Idehen.