Second-half headers from Mathias Pogba and Danny Wright handed Wrexham a 2-0 win over Cambridge in their FA Cup first round replay.
Pogba caused the Us all sorts of problems at the Racecourse Ground in the first half but had to wait until the 59th minute to break down a determined visiting defence.
Wright added a second with a bullet header of his own 17 minutes later before a late scare from Cambridge defender Michael Wylde but the Red Dragons held on for a second round clash with Brentford.
Either team could have broken the deadlock in the opening 20 minutes with Joe Clarke seeing a shot deflected wide for Wrexham and Cambridge striker Michael Gash firing wide from close range.
Pogba soon started to become a thorn in the visitors' side and got the goal he deserved after the break, latching onto a Curtis Obeng cross before the same defender set up Wright in the 76th minute.
Wylde gave Cambridge a glimmer of hope with three minutes left, nodding home a James Jennings cross, but it was too little too late for Jez George's young charges.