Brentford boss Thomas Frank paid tribute to debutant goalkeeper Ellery Balcombe after his two spot-kick saves ensured the Bees edged past Newport 3-0 on penalties after a 1-1 draw at Rodney Parade.
Mathias Jensen thought he had won the Carabao Cup tie for the visitors in the 88th minute but teenage substitute Kiban Rai headed home deep into stoppage time for the hosts to take the game to spot-kicks.
