The kick-off of this game was delayed as storms raged around Billingham.
Once it did get underway it was a game of few chances but Boro Reserves, copying the first team's performance on Saturday, scored in stoppage time.
James Morrison's shot from the edge of the area clinched it for the home side.
Boro Team:
Knight, McMahon, Bates, Cooper, Taylor, Morrison, Cattermole, Wilson, Johnson (Reed 79), Graham, Kennedy (Craddock 72)