Dagenham & Redbridge followed up their 6-2 midweek win with another impressive performance to beat in-form Grimsby.
Ross Smith's header gave the visitors the lead and Dave Rainford made it 2-0 with a penalty after Jamie Clarke had impeded Ben Strevens in the box.
Dagenham's Scott Griffiths headed a Nick Fenton header off the line, but a Strevens solo goal made it three.
Rainford nodded home his second from a corner, before Gary Jones grabbed a consolation with a left-footed shot.
Grimsby: Barnes, Atkinson, Fenton, Newey (Bennett 25), Hird (Jones 19), Hegarty, Bolland (Bore 46), Hunt, Clarke, Till, North.
Subs Not Used: Montgomery, Toner.
Booked: Fenton.
Goals: Jones 90.
Dag & Red: Roberts, Smith, Arber, Uddin, Foster , Griffiths, Gain, Southam, Rainford, Nurse, Strevens.
Subs Not Used: Hogan, Boardman, Taiwo, Baidoo, Hall.
Booked: Foster .
Goals: Smith 16, Rainford 31 pen, Strevens 82, Rainford 85.
Att: 4,060
Ref: Trevor Kettle (Rutland).
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