On a very cold afternoon, Hawick took to the Neilson Park turf with a strong breeze in their favour in the first half, but it was the hosts who were out of the blocks quickest with a converted try under the posts in the opening minutes.
This spurred the Teries into action and Haddington rarely escaped out of their own end of the pitch for the remainder of the half.
Michael Robertson burst away to score Hawick’s opening try which Neil Renwick converted.
Liam Lawrence then finished off with a try in the corner following good play by both backs and forwards, Renwick again converting from far out.
It was all Hawick at this stage and Greg Cottrell strolled in under the posts for another converted try which gave the visitors a healthy 21-7 lead at the interval, but with the elements to face in the second half.
Haddington had the territorial advantage in the opening spell of the second half. but were unable to break down a very solid and well-organised Hawick defence.
With the home side now tiring it was the Greens who kept the ball in hand and gave Haddington all manner of problems.
A good try by Graham Hogg was followed shortly afterwards by another by Bruce McNeil, which put Hawick out of sight at 31-7.
With time now running out, a final flourish saw Nick Mctaggart split a very tired Haddington defence to score under the posts which Renwick again converted.
Hawick: N. Renwick; S. Anderson, G. Johnstone, G. Hogg, L. Lawrence; R. Hutton, G. Cottrell; S. Muir, H. Scammell, B. McNeil, B. Keown, J. Tinlin, N. Mactaggart, R. Scott, M. Robertson. Subs: S. Linton, M. Landels, K. Davies, N. McColm, L. Armstrong.