Harlequins RL have opened up a 10-point gap at the top of the Frontline Fair Play Index after conceding just seven fair play points in their 36-12 defeat against Wigan Warriors last Saturday.
Wakefield Trinity Wildcats are chasing the leaders and have moved into joint second place with Crusaders RL after conceding 10 fair play points in their 41-0 victory against the Welsh club on Sunday.
Wigan Warriors are the biggest movers this week after conceding 15 fair play points in their win against Harlequins RL. Wigan slip to 11th in the table, only 30 points in front of bottom-placed Catalans Dragons.
Catalans moved further adrift from nearest rivals Salford City Reds with the 13 fair play points they conceded against Hull FC last Friday opening up a 22 point gap between the teams.
In the Co-operative Championship, Sheffield Eagles claimed the top spot in the Frontline Fair Play Index after Round 15 and are six points clear of second-placed Batley Bulldogs, who have played one less game.
Barrow Raiders have dramatically fallen in the table and are no longer sitting comfortably at the top after dropping to seventh position. The Raiders conceded 35 fair play points after forward Rob Roberts was suspended for five matches following an illegal use of the forearm in their match against Whitehaven.
Widnes Vikings moved further adrift at the bottom of the table after conceding 13 points and there is now an eight-point gap between them and their nearest rivals, Halifax.
At the end of the regular season the teams which finish top of the Frontline Fair Play Index in the Engage Super League and Co-operative Championship will each be presented with a £5,000 prize from leading bathroom suppliers Frontline Bathrooms, as well as a specially engraved trophy to mark their achievement.