The sides battled their way to a 0-0 draw at Boston Town's DWB Stadium.
Clear-cut chances were at a premium, with United's Leighton Boughen denied by the visiting goalkeeper in arguably the game's clearest opening.
Boston (3-4-1-2): Oliver Swaby; Taylor Gray, Jack Withers, Callum Rodger; Marshall Young, Peter Evison, Jack Henton (Will Jackson 46); Arkadiusz Michalczyk (Jamie Gaukroger 46); Leighton Boughen; Jenson Bark, Ryan Pratt. Subs (not used): Jenson Ball, Harrison Holland, Seth Greeves (gk).