Champions St Helens are away to Catalans Dragons. Saints were beaten by 42 points to nil when they last played in the south of France, but beat the Dragons on the opening night of the 2015 season. Castleford are looking to complete a Super League double over Wigan. The Tigers won 42-14 when the teams met at the Jungle in March. Super League leaders Leeds are away to Widnes and the bottom club Wakefield visit Hull KR. Warrington are at home to Hull FC and Salford play Huddersfield.