The draw for the Challenge Cup Fourth Round in full is:
London Broncos v Dewsbury Rams
Widnes Vikings v St Helens
Leeds Rhinos v Wakefield Trinity Wildcats
Whitehaven v Salford City Reds
Featherstone Rovers v Castleford Tigers
Hull FC v Huddersfield Giants
Wigan Warriors v North Wales Crusaders
Swinton Lions v Gateshead Thunder
Hull KR v Catalan Dragons
Bradford Bulls v Doncaster
South Wales Scorpions v Halifax
York City Knights v Sheffield Eagles
Keighley Cougars v Warrington Wolves
Leigh Centurions v Rochdale Hornets
Oldham v Barrow Raiders
Hunslet Hawks v Batley Bulldogs