Grant Holt scored a hat-trick as Norwich responded to the nightmare of their 7-1 home defeat by Colchester on Saturday by claiming an emphatic 4-0 Carling Cup first-round win at Yeovil.
The game was goalless at half-time but the Canaries, relegated from the Coca-Cola Championship last season, took the lead 10 minutes after half-time when Wes Hoolahan converted a penalty after Scott Murray fouled Cody McDonald.
Holt doubled the lead with a header before two goals in eight minutes - the second from 25 yards - sealed the crushing victory.
Southampton, relegated alongside Norwich, moved into the second round following a 2-0 win over Northampton.
The Saints went ahead when Rickie Lambert scored his first goal for the club with a first-half header.
Adam Lallana then scored from close range in the 69th minute to seal victory.
Colchester could not replicate their form from the weekend and went out 2-1 at the first hurdle to Leyton Orient despite pulling back a last-minute goal.
The visitors got off to an ideal start when Adrian Patulea headed them ahead in the second minute with John Melligan doubling the lead in the 63rd minute.
The Us were reduced to 10 men when Clive Platt was dismissed for violent conduct following Ryan Jarvis' foul on Kemal Izzet.
The hosts scored from Simon Hackney's resulting free-kick but it was not enough.
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