Sam Tomkins' late try sealed a 19th Challenge Cup for Wigan over an error-strewn Hull FC.
Both sides were cautious in the build-up due to the heavy rain but from the kick-off, Richards kicked out on the full to give Hull a penalty and put pressure on Wigan but good defence kept them out.
Green forces a mistake from Crooks and Richards went over the line only to be held up on his back but Wigan pushed and earned two dropouts as Hull scrambled defensively.
But on the 20 minute mark, a knock on by Crooks have Wigan field position and Thornley took advantage by evading a Tickle tackle to go over for the opening try which joined by Richards' kick saw Wigan lead 6-0.
They could have been further ahead as McIlorum spied a gap but Yeaman denied a second try. Miller fumbled and from the scrum, McIlorum had a chance but lost the ball near the line
Crooks could have cost Hull again in the 32nd minute but they pushed on and came close to levelling only for Tickle to drop near the try line.
As the hooter blasted, Smith attempted a drop goal but narrowly missed meaning Wigan led 6-0 at the interval.
Hull went 8-0 behind inside two minutes of the second period as Whiting committed a High Tackle on Taylor and Richards successfully kicked for goal.
Hull should have scored in the 48th minute as a break by Shaul saw him caught and denied a certain try by a lightning chase by Charnley not dissimilar to the save he made on Brough last week.
A long delay ensured as Goulding was carried off on a stretcher and with Hull in a great position, they knocked on and a resulting kick from Smith forced a dropout with Shaul tackled in goal.
8-0 became 10-0 as Richards kicked a penalty after O'Loughlin was taken out and the fans behind the sticks gasped as the kick bounced over via the post.
Hull pushed to close the gap but errors crept in and a vital win for Wigan was completed as Sam Tomkins went over to a chaotic cheer by the fans in front of him and Richards' kick meant an unassailable 16-0.
Matty Smith received the Lance Todd trophy as man of the match and Wigan celebrated a 19th Challenge Cup title with their fans .