Deeping boss Tuncay Korkmaz saw his side smash four goals past local rivals Holbeach but was just as pleased with the defensive display as he was with his strikers.
Alex Beck fired Rangers ahead on 12 minutes and Jamie Graham added a second midway through the first half as the hosts dominated, particularly down their right side against a young Tigers outfit.
Chris Shipley went close for Holbeach towards the end of the first half and Tigers’ boss Glen Maddison tightened things up with a couple of substitutions at half-time that at least made things more competitive after the break.
Ryan Oliver continued his excellent form with Deeping’s third six minutes into the second half although it had more than a hint of offside about it and substitute Scott Ginty completed the rout directly from a corner as the wind took his flag-kick straight into the net.
Maddison admitted his weakened side struggled to cope with the home side’s greater physical strength.
He said: “Deeping are a very good side and they were far too strong for us physically.”
Already without Matty Warfield and Tommy Treacher, who were attending the latter’s wedding, Maddison also had to go without Tom Sargeant (also at a wedding), Nick Bishop (back injury) and Luke Hollingsworth who was playing cricket for Billingborough against Bourne.
Deeping boss Tuncay Korkmaz was delighted as Rangers made it 13 points from their last five league games.
He said: “Conditions were not ideal as the pitch was really hard and the wind was all over the place.
“It can become a lottery in those conditions so full credit to my defence for keeping a clean sheet.
“The midfielders all worked hard and it was really pleasing to see four different players score so it was a good afternoon.
“Once the second went in it was game, set and match and it was just a case of seeing the game out.
“I couldn’t have complained had the third been disallowed for handball but Ryan finished it well.”
Rangers play Huntingdon Town at Yaxley FC in their first-ever knockout cup final in 13 days’ time.
Meanwhile, Holbeach manager Glen Maddison admitted it was men against boys at Deeping on Saturday.
He said: “They were so much stronger than us and it was literally men against boys
“Young Ryan Leggtt looked like a fish out of water so I took him off and brought Max Matless on, as well as bringing James Reed on for Adam Rothery and then I thought we competed better with a 3-5-2 formation.
“They also play with five in midfield so we were more able to match them.
“But they scored early in the second half with a goal which should have been ruled out for offside.
“We were not at the races in the first half.
“We were so far off the pace, although they didn’t create that many chances.
“They created four chances but took two of them while we had a couple of chances without taking them.
“At least we made it more difficult after the break, which was a positive.
“Kieran Elliott looked a bit jaded and we picked up a few knocks which didn’t help.
“Ash Murrell got a knock and Leigh Overton, who has played every minute of every game this season, pulled his thigh.”
Deeping: Doughty, Flack, Cartwright, Tinkler, Ashton, Burton-Jones, Beck, Holt, Oliver, Braithwaite, Graham. Subs: Ginty, Simpson, Bugusz.
Holbeach: Overton, Delahunty, Leggett (Mattless), Murrell, Shipley, Elliott, Law, Rothery (Reed), Bayliss, Waumsley (Keeble), Dunn.