Danny McGuire equalled the Super League record for tries in a season as Leeds demolished St Helens at Headingley.
Leeds (38) 70:
Tries: Bai 3, McGuire 3, McDonald 2, Diskin, Mathers, Lauiti'iti,
Goals: Sinfield 11
St Helens (0) 0:
The stand-off celebrated a nine-minute hat-trick before half-time to equal the 28-try record set by Paul Newlove.
Winger Marcus Bai also claimed a hat-trick as the 12-try Rhinos became the first club to nil the shell-shocked Saints in Super League history.
Leeds skipper Kevin Sinfield missed only two of his 13 kicks at goal to finish with a tally of 22 points.
The Rhinos were forced into a late re-shuffle, with scrum-half Andrew Dunemann falling victim to a stomach bug.
But that minor setback failed to faze the home side as they tore into Saints from the kick-off.
The visitors, who were missing the influential Paul Sculthorpe, got off to the worst possible start, with Paul Wellens putting the ball dead from the kick-off.
Bai scored the game's first try after only 89 seconds as the Rhinos raced into a 26-0 lead after just 20 minutes.
He added another before substitute Wayne McDonald crashed over for his side's sixth try on the stroke of half-time.
McDonald grabbed his second try within five minutes of the re-start and the impressive Matt Diskin celebrated his 100th appearance for the Rhinos with another touchdown.
There were further scores for Richie Mathers, Ali Lauiti'iti and Keith Senior, although it would have been more but for two try-scoring tackles from Darren Albert.
Saints also had prop forward Bibey placed on report for a high tackle on Matt Adamson and warned on two other occasions for suspect challenges.
Leeds coach Tony Smith refused to get carried away by his side's victory over the Challenge Cup winners.
"We've been humbled by Saints before so we're going to be pretty humble now," said the Australian.
But he conceded: "It was the best performance I've been involved with since I've been here."
Smith was naturally delighted with his side's defensive clean sheet, saying: "It's a remarkable achievement against a team like Saints."
St Helens coach Ian Millward said the drubbing was one of the low points of his Knowsley Road career.
"It was very disappointing," said the Australian. "It was probably the worst loss in my time at the club.
"The guys are very upset but there is no individual blame. We are in this together and we need to do something about it."
Leeds: Mathers, Cummins, Walker, Senior, Bai, Sinfield, McGuire, Ward, Diskin, Bailey, McKenna, Lauiti'iti, Poching. Replacements: Burrow, McDonald, Adamson, McDermott.
St Helens: Wellens, Gardner, Albert, Gilmour, Feaunati, Talau, Hooper, Fozzard, Cunningham, Mason, Edmondson, Fa'asavalu, Wilkin. Replacements: J. Roby, Bibey, Hardman, Bennett.
Referee: Karl Kirkpatrick (Warrington).