Warrington's treble hopes suffered a blow as they went down to the resurgent Saints 20-18.
A Mark Percival penalty midway through the second-half was the only difference between the sides, securing a sixth straight victory for Keiron Cunningham's side.
The visitors held a 12-6 lead at half-time thanks to scores through Louis McCarthy-ScarsbroAlready a subscriber? Log in here
This story is FREE for you...
Create a free account to access this article and get more of Total Rugby League's top stories.By submitting your email address you agree for Total Rugby League to send you communication by email