Super League leaders Castleford Tigers will begin the Super 8s phase of the season at home to St Helens on 3 August.
Wakefield Trinity's hopes of a top-four finish to the regular season are ended by a home defeat by St Helens.
Leigh sign prop Greg Richards from St Helens on a deal until the end of November 2018, with an option of a further year.
Three tries in the final 10 minutes help St Helens boost their top four hopes with a battling win over Catalans Dragons.
Audio & Video
Leeds Rhinos' Ryan Hall caps off a fine move to score a crucial try in their 24-22 victory over St Helens as this week's try of the week.
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