Aaron O'Connor hit a superb double as Rushden & Diamonds saw off Blue Square North side Hinckley United.
O'Connor's curling shot put Rushden ahead just after the half-hour mark but Adam Webster headed home Alex Taylor's cross to equalise after the break.
The home side hit back just two minutes later when O'Connor latched on to a long ball before beating two defenders and hitting a left-foot shot.
On-loan Mark Byrne lobbed Chris MacKenzie to seal the victory late on.
Rushden and Diamonds boss Justin Edinburgh told BBC Radio Northampton:
"I think we were a little bit slow out of the blocks.
"Sometimes you've got to credit the other side and I thought they started brightly.
"I knew they worked very hard for one another but once we got a foothold on the game then I think we deserved our win."
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