Scarborough brushed aside sorry Dagenham, winning comfortably thanks to first-half strikes from Chris Senior and veteran Neil Redfearn and late headed goal from Colin Cryan.
The Daggers failed to gain real momentum and were left to rue an early Craig Mackail-Smith opportunity. Receiving Jake Leberl's early pass, Mackail-Smith did well to hold off Mark Hotte, the last Scarborough defender, only to see keeper Leigh Walker save his low shot from ten yards.
The visitors responded well and Senior saw his angled shot fly over the bar after a defensive mix-up in the Daggers' back line.
The visitors gained were denied by a brave save from Paul Bastock as Robert Gill went through on 14 minutes.
With Redfearn pulling the strings in midfield, the visitors took the lead four minutes later. Gill had his shot saved by Bastock but the alert Senior followed up to stroke home the opportunity.
Dagenham appeared to be in shock as Boro piled on the pressure.
Scarborough were further rewarded after 35 minutes when Cryan crossed from the right and Redfearn made no mistake from close on in.
Dagenham ended the half with a succession of corners but lacked real penetration to break a solid Seadogs defence.
Early second half Daggers pressure threatened to haul the home team back into contention but Scarborough absorbed what was thrown at them and five minutes before the full time were 3-0 up.
Redfearn's corner was headed back by Hotte into the path of Cryan, whose header found the target from five yards.