Played on Sunday:
CARDIFF CITY 0 ARSENAL 0
Last season's runners-up Cardiff battled all the way to hold the 10-times champions, with goalkeeper Peter Enckelman keeping out the best of the Premier League side's efforts.
Cardiff also had chances and hit the bar late on through Ross McCormack in what could be the last Cup game staged at Ninian Park, the ground Cardiff are leaving after 99 years at the end of the season.
LIVERPOOL 1 EVERTON 1
The Mersey rivals drew 1-1 for the second time in a week and again Steven Gerrard was on target.
After putting the hosts ahead in Monday's Premier League game, the captain earned a Cup replay with a low shot early in the second half on Sunday after Joleon Lescott scored with just about Everton's only chance of the match.
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Played on Saturday:
CHELSEA 3 IPSWICH TOWN 1
Michael Ballack scored twice and Frank Lampard hit the other as the Premier League side reached the fifth round for the 11th successive season.
Ballack side-footed home after 16 minutes but Ipswich struck back through Alex Bruce.
Ballack put Chelsea back in front after 59 minutes with a well-taken freekick before Lampard made it 3-1 with a superb long-range free kick.
DONCASTER ROVERS 0 ASTON VILLA 0
Championship strugglers Doncaster Rovers played above themselves and hit the bar twice although Villa went close with efforts from Gabriel Agbonlahor and Curtis Davies, while Agbonlahor also hit the bar late on.
HARTLEPOOL UNITED 0 WEST HAM UNITED 2
West Ham wrapped up a straight-forward victory with two goals at the end of the first half.
Swiss international Valon Behrami opened the scoring before Mark Noble doubled the score in first-half stoppage time from a penalty after Hartlepool defender Michael Nelson was harshly punished for a handball as he was outside the area.
HULL CITY 2 MILLWALL 0
Hull made it through to the fifth round for the first time in 20 years as goals from Michael Turner and Ian Ashbee earned a 2-0 win over the League One (third division) side.
Turner headed in Andy Dawson's free kick before Ashbee scored from 20 metres.
KETTERING TOWN 2 FULHAM 4
Fulham needed two late goals from Andrew Johnson and Bobby Zamora to see off minor league side Kettering who twice equalised through Craig Westcarr.
Simon Davies scored for Fulham after 12 minutes before Westcarr equalised. Danny Murphy put Fulham ahead 13 minutes from time, Westcarr made it 2-2 with a penalty before Fulham regained control.
MANCHESTER UNITED 2 TOTTENHAM HOTSPUR 1
United came from behind after Roman Pavlyuchenko had headed the visitors into the lead after
