Victory secured Leigh’s place in the play-offs for the fourth consecutive season and kept them fifth in the table. They could yet move up to fourth, above Wakefield, after next week’s final round of fixtures.
It took them 10 minutes to score the first try as Saints failed to deal with Cook’s kick, which fell for Leigh to spread the ball for Charnley to walk in on the right wing.
He then celebrated by signing a mock contract and, moments later, the public address confirmed he had signed a new deal for the 2027 season.
Leigh scored a second try four minutes later as Armstrong, Cook and Lachlan Lam combined from deep in their own half to break up the left before Armstrong sprinted in from halfway.
Saints responded by working space for Douglas to go over in the right corner before phenomenal feet from Harry Robertson left the defence for dead and he sent Sailor under the posts.
But Robertson then missed a tackle that allowed Innes Senior to break for Leigh and create Hanley’s first try, before Ipape drove for the line, his offload went to ground but Cook grubbered in-goal and touched down.
After half-time, St Helens blew a two-on-one on the left wing before they lost Percival – who recently announced he will retire at the end of the season – to the sin bin for a high tackle.
Leigh eventually made the extra man count when a second set of six and a quick play-the-ball under the posts led to Ipape barging over.
Shane Wright then gave a penalty away for obstruction in the shadow of his own posts and Leigh worked the ball to Hanley on the right, who burst through three tackles to find the line.
Further tries in the rain would follow as Alick-Wiencke slid in before Mulhern charged over with the final play of the game.
Leigh: Armstrong; Senior, Brand, Handley, Charnley; Cook, Lam; Ofahengaue, Horne, Mulhern, Alick-Wiencke, Trout, Liu.
Interchanges: Brogan, Badrock, Davis, Ipape.
St Helens: Sailor; Douglas, Percival, Welsby, Cross; Robertson, Lomax; Klemmer, Humphreys, Horst, Keeley, Wright, Shorrocks.
Interchanges: Marsh, Evans, Matagi, Knox.
Referee: Chris Kendall.
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