Tom Briscoe became the first player to score five tries in a Challenge Cup final as Leeds racked up the most comprehensive victory in the history of the competition.
The England winger went over for four tries in the second half as the Rhinos completed a 50-0 whitewash, eclipsing their 52-16 rout of London Broncos in 1999.
Briscoe's haul broke the record set by another Leeds winger, Leroy Rivett, who scored four tries in that match 16 years ago and it was little surprise when he was named man of the match.
Hull looked shaken as Brett Delaney scored an early try to set the Rhinos on their way and, in truth, the East Riding outfit never recovered
Leeds, on the other hand, looked at ease from the kick-off as they cantered to a 13th Challenge Cup success and pulled ahead of St Helens as they pursue Wigan’s record haul.
Sinfield kicked the first of his seven goals following Delaney’s opener and the game was as good as over when the ruthless Rhinos struck twice more in the space of two minutes prior to the break.
McGuire supported a half-break by centre Joel Moon to touch down in the 400th appearance of his career and, after left winger Ryan Hall ran the ball back straight from the restart, right winger Briscoe weaved his way through a wrong-footed defence on the next play for his side's third try.
Rovers rallied briefly after the interval but, in truth failed to seriously trouble the Rhinos defence and it was left to Briscoe to put the game beyond doubt six minutes after the break.
The former Hull man outjumped full-back Kieran Dixon to gather Maurice Blair's high kick and held off a spirited last-ditch challenge from Ken Sio, racing across from the opposite wing, to touch down after a 90-metre sprint.
Sinfield's conversion went in off an upright to make it 22-0 and it got worse for the Robins when Leeds replacement prop Brad Singleton forced his way over for a fifth try after 57 minutes.
In a rare foray deep into Leeds territory, Hull KR second-rower Larroyer was held up over the line before Leeds produced another demonstration of slick finishing when Briscoe took Kallum Watkins' pass to complete his hat-trick after 65 minutes.
The classy Watkins then carved out a try for substitute Rob Burrow and Briscoe finished off the rout with two more tries in the last five minutes as Rovers fell apart.