The unbeaten leaders came out a touch flat in the second half and let Matamata back into the contest for a time, before Dion Bartosh scored a double inside four minutes to kill off any chance of a fight-back.
Bartosh proved an ideal target up front all day when allied to the speed of the wingers - especially late in the second half when substitute Luke Barlow showed off his tricky feet to skin his opposite down the left a number of times.
Matamata barely threatened apart from a brace of late shots that sailed over the Old Blues' bar, with the back division showing a promising combination of size, speed and experience.
Old Blues co-coach John Whitley was happy but not satisfied with his side's win.
"It was scrappy, but we keep winning and people on the sideline tell us that we are playing well so we'll take it."
The Tauranga City life member would love a crack at the club's cross town rival but was not sure if that is a realistic proposition.
"We are only one step away from playing where Tauranga City play and at this point I think we are good enough to go out and give them a decent game," said Whitley.
"I'm not sure if the club is ready to go up just yet though, because the next step is Auckland every second week travel-wise and I'm not sure the club is funded well enough for that. If we win we will have a look at it."
The second string Old Blues outfit was equally impressive in the curtain raiser, seeing off their Matamata equivalents with a clinical opening half that produced four goals.
Ian Trotter had a double by the 22nd minute before Matt Lavis and Stephen Flude got themselves on the score sheet, and when the impressive Franz Marko netted in the second minute of the second half to make it 5-0, it seemed as though a rout was on the cards.
The home side dominated territory and possession, but failed to put in a full shift in a second stanza won 2-1 by the away team that hit the woodwork twice and spurned a number of other opportunities.
Federation One:
Old Blues 4(Dion Bartosh 2, Reuben Wood, Andrew Cooper) bt Matamata 0.
Federation Two:
Old Blues 5 (Ian Trotter 2, Matt Lavis, Steven Flude, Franz Marko) bt Matamata 2 (L Clothier, Tosh Ode)