Barker scored after Michael Mackay's cross and headed home Jamie McCunnie's corner, before Gary Liddle headed in after keeper Adam Sollitt's poor punch.

Ian Moore made it four in the 69th minute after more good work by McCunnie, and Joel Porter crossed for James Brown to head in the fifth.

Substitute Porter completed the rout eight minutes from time, when he cut in from the right and fired past Sollitt.

Gainsborough: Sollitt, Wood, Parker, Pell, Drury, Callery (Wiggins-Thomas 77), Anson, McMahon, Needham (Mallon 74), Clayton (Smith 77), Hall.
Subs Not Used: Davidson, Ellis.

Booked: Anson.

Hartlepool: Budtz, McCunnie, Nelson, Clark, Humphreys, Moore, Sweeney, Liddle (Antwi 56), Brown, Barker (Monkhouse 67), Mackay (Porter 52).

Subs Not Used: Lee-Barrett, Foley.

Booked: Clark.

Goals: Barker 8, 25, Liddle 51, Moore 70, Brown 76, Porter 82.

Att: 2,402

Ref: Richard Beeby (Northamptonshire).