Castleford crushed St Helens 53-10 to seal their place in the Challenge Cup quarter-finals.
Michael Shenton and Jake Webster put Cas ahead early on, before Ryan Morgan got Saints on the scoreboard.
The Tigers quickly regained their composure with Webster grabbing a second, while Paul McShane, Greg Minikin and Nathan Massey effectively ended the tie with further tries before the break.
Greg Eden (3) and Minikin again sent Cas further in front, although Luke Douglas did manage a late consolation for St Helens.
Castleford: Hardaker, Minikin, Webster, Shenton, Eden, T. Holmes, Gale, Lynch, McShane, Millington, Sene-Lefao, McMeeken, Milner.
Replacements: Massey, Roberts, Moors, Cook.
St Helens: Makinson, Swift, Percival, Morgan, Grace, Fages, Smith, Walmsley, Roby, Douglas, Taia, Knowles, Thompson.
Replacements: Amor, Wilkin, McCarthy-Scarsbrook, Richards.