Cas were too strong for Saints, winning 22-6.
Salford got the win at the AJ Bell Stadium, downing Hull FC 18-6.
Keighley upset Bradford 25-24 thanks to a Matty Beharrell drop goal in what was Geoff Toovey’s first game in charge of the Bulls.
Hunslet RLFC were pipped by Hunslet Parkside 19-18.
Leigh outclassed Dewsbury 36-4 in their match today.
Wakefield trounched Sheffield 50-6 in their clash at Belle Vue.
Doncaster just edged an academy Leeds Rhinos side 35-34.
London overpowered York 48-22 at Bootham Crescent.
And in an all-League 1 clash Barrow scored a 36-18 victory against Coventry.