A wonderful night for St Helens saw them thrash fellow Super League front-runners Warrington Wolves as Wigan lost at Wakefield.
St Helens saw their unbeaten record in Super League this year come to an end as they came up short against Catalans Dragons.
Hull FC were subjected to a heavy home defeat by Warrington Wolves in Super League on Friday.
Both Huddersfield Giants and St Helens celebrated huge Super League victories on Friday.
An entirely one-sided second half saw St Helens make it six wins from six in Super League this season.
Huddersfield Giants claimed their first win of the season to add to Wigan's woes, while St Helens and Hull FC claimed emphatic victories.
James Roby scored two tries as St Helens recorded a 26-4 win over Salford Red Devils to move two points clear at the summit.
Alex Walmsley ran in two tries as St Helens scored 17 unanswered points in the second half to defeat Leeds Rhinos on Friday.
There were wins for St Helens and Salford Red Devils in Super League on Sunday.
Jonny Lomax has followed James Roby and Tommy Makinson in signing new deals with St Helens.