The Pilgrims were 3-2 victors over Gainsborough Trinity at The Northolme - with Pollock on target in the ninth, 42nd and 45th minutes.
Andrew Wright and Tom Cursons cut the deficit after the break, but United held on for the win.
Boston (3-4-2-1): Rhys Davies; Ben Pollock, Luke Shiels, Trialist A; Keenan Ferguson, Brad Abbott, Lebrun Mbeka, Alex Brown; Scott Pollock, Jordon Crawford; Jaanai Gordon. Subs (used): Jake Wright, Ellis Myles, Trialist B, Trialist C, Trialist D, Trialist E, Trialist F; (unused): Owen Sheriff, Jake Frestle (gk).
Referee: James Moody.
Attendance: 329.
PIC: Oliver Atkin.