It's first against second at Headingley as Leeds take on St Helens. The Rhinos recorded a stunning 41-16 win when the sides met earlier in the season, but the teams have been neck and neck at the top of the table for most of the year. Third placed Wigan are away to Warrington. The Warriors are just two points from the top of the table and face a Warrington side which has lost three of its last four Super League matches. Castleford are looking for a fifth consecutive win when they face Widnes, Salford play Catalans and Huddersfield are at home to Hull KR. Hull FC play Super League's bottom club Wakefield.