Southampton striker Brett Ormerod scored a hat-trick as Premiership Saints disposed of Second Division Tranmere to book their place in round three.
Ormerod became the first Southampton player to score a competitive treble for almost six years as Gordon Strachan's side notched up only their second victory of the season.
Midfielder Chris Marsden opened the scoring after just 16 seconds to signal the start of a miserable night for unlucky Tranmere after a first minute blunder from on-loan goalkeeper Phil Whitehead.
Marsden seized on Whitehead's mis-hit clearance before casually chipping the ball into an unguarded net from 35-yards.
Tranmere drew level against the run of play 20 minutes later when defender Graham Allen benefitted from a moment of uncertainty from the Southampton defence to ram home from two yards.
Full-back Allen drilled the ball in off the left-hand post after midfielder Micky Mellon had picked him out unmarked with a 25-yard free-kick. But Tranmere's joy was short lived as the in-form Ormerod quickly restored Southampton's lead with his first of the night just four minutes later.
The former Blackpool striker put Southampton back in front with a spectacularly overhead kick after Fabrice Fernandes' cross had been headed into his path by strike partner James Beattie.
Ormerod made it 3-1 three minutes before half time when he calmly slotted the ball under the grounded Whitehead after midfielder Marsden had turned defender Allen on the edge of the area to cross from the left.
Frenchman Fernandes further extended Saints' lead seven minutes into the second half when he fired an unstoppable shot past Whitehead from the edge of the penalty area for his second of the season.
Defender Michael Svensson scored his first of the season to make it 5-1 on 65 minutes after Swedish international team-mate Anders Svensson had crossed from the right.
Ormerod completed his hat-trick 23 minutes from time racing on to Marsden's throughball before firing in number six from midway inside the Tranmere area