The road to Wembley got underway this weekend for the 12 Super League Clubs. In a round where there were no shocks Castleford, who let slip a 14-0 half time lead, were the only Super league side to exit the competition.
World Champions Leeds Rhinos were given a scare by Welsh side Celtic Crusaders who came back from 14-0 down to only trail by four points at the break, but Leeds upped their tempo in the second half to run out winners. Elsewhere Warrington were given a game by Leigh who only lost by 12 points and the same for Featherstone who were competitive against last years runners-up Catalans Dragons.
Injury hit Wakefield Wildcats, easy disposed of the unbeaten National League leaders Salford City Reds in tie that on paper had the making of an upset.
The Draw for the fifth round will take place on Tuesday night with the prospect of some exciting ties.
Leeds Rhinos 38-16 Celtic Crusaders
Whitehaven 46-6 FC Lezignan-Corbieres
Bradford Bulls 98-6 Toulouse
Harlequins RL 44-14 Castleford Tigers
Barrow 48-16 Hunslet
Batley 12-26 Dewsbury
Doncaster 12-38 Widnes
Featherstone 12-22 Catalans Dragons
Halifax 24-42 Huddersfield Giants
Leigh 16-28 Warrington Wolves
Rochdale 5-42 Hull FC
Salford Reds 8-38 Wakefield Wildcats
St Helens 56-0 London Skolars
Swinton 8-20 Oldham
Wigan Warriors 74-4 SM PIA
Workington 12-68 Hull KR