With just seven rounds to go in the regular season, the race for a place in the top eight - which guarantees Super League survival - intensifies. St Helens, under new head coach Justin Holbrook, take on the League leaders Castleford. The two teams met just three weeks ago in the Challenge Cup, when Castleford put on a sensational performance to beat St Helens by 53 points to 10. St Helens will be out to avenge that defeat, but Castleford have become the favourites to win the Super League title this season and their supporters will be hoping for another big win.Champions Wigan travel to Hull FC. The two teams were closely matched in their first meeting of the season, with Hull running out winners by just two points. An injury-hit Wigan have fallen out of the top four in recent weeks but with players returning, they will be keen to get their season back on track. Leeds are at home to Leigh, Huddersfield face Warrington and Widnes play Catalans. Salford hope to further cement their place in the top four when they take on Wakefield.