The visitors went 1-0 ahead as Reds rued their missed chances in front of goal.
Saints continued to dominate the majority of possession, but Sundon kept out their goalbound efforts.
After the break, Jai caused the visitors problems with his pace and dribbling as he had a header miraculously saved, while David fire the rebound over.
Saints created more chances that went begging and with five minutes left, fell 2-0 behind when another free kick sailed over Lewis’ head.
The third soon followed, while Toby, Aman, James were all joint men of the match for their excellent displays.
Dylan Fitzpatrick (2) and William Johnston were on target for Sundon as Joe Michael Clarke was their top performer.
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