Steve Welsh took the bold decision to leave seven of his FA Youth Cup side at home — and saw his experimental side thumped 8-1.
United’s consolation arrived from the penalty spot through centre-half Joe Cain.
Boston (4-4-2): Jamie Bradley; Jack Foyster, Daniel Moulds, Joe Cain, Jack McCallum (David Olalere 46); Daniel Holland, Joe Money, Jack Dykes, Alex Dempster; Louis Saebe (Conor Allen 46), Karolis Andriulionis (Scott Floyd 46).