Southend United 0-2 Hull City
Matty Fryatt scored both goals as Hull beat League Two Southend to reach the FA Cup fifth round.
The Shrimpers, who are managed by ex-Tigers boss Phil Brown, had chances to score, with Michael Timlin hitting the bar from 35 yards.
But David Meyler played in Fryatt, who beat two Southend defenders to fire home in the 63rd minute.
And in injury time the striker cut in to beat keeper Daniel Bentley and seal the win.
Hull boss Steve Bruce did not field a full-strength team against Brown's promotion chasers although it was still enough to see his Premier League side through.
Heavy rain made the pitch difficult work for both sides and Southend almost matched their opponents for the first half.
Steve Harper produced a fine save from close range to deny Barry Corr's header before Danny Graham missed a simple chance for the visitors.
Timlin had Southend's biggest chance early in the second half when his shot came back off the crossbar and Corr headed the rebound straight at Harper.
Fryatt then made them pay when he drove home a low opener into the bottom-right corner.
With the hosts not looking like forcing a replay, Fryatt ended any doubt late on when he beat Bentley at his near post.
Southend boss Phil Brown:
"I am proud of them, but just disappointed that in the final third was a difference between the two teams, which is where Hull showed a lot of quality.
"We just did not have that belief and that comes from the exposure to Premier League football and the depth they have.
"With a bit of luck, we could have caused a bit of an upset, and the first goal was so important, their keeper made a vital save in the first half, then we hit the bar and soon after, we are behind."
Hull boss Steve Bruce:
"I would not expect a team of mine to roll over just because we are coming here in the cup, so they showed the right desire and attitude.
"The pitch was difficult, and towards the end it was awful conditions, a typical cup tie, sometimes in football you have to roll up your sleeves and we did that in abundance today to get through.
"Somebody like Matty Fryatt, if I don't give him an opportunity to play, then they are knocking down the door. He had come back into the side today and reminded me what a good player he is."