After a goalless first half, Crawley struck three times within 21 minutes as Nick Tsaroulla, Ashley Nadesan and Jordan Tunnicliffe all beat 'keeper Kiko Casilla to progress to the fourth round, despite there being 62 league placings between the two sides.
Graham Smyth, the YEP's chief football writer, hands out the scores.
7. Gjanni Alioski
4 - Allowed frustration from a first half coming together to eat at him for the remainder of the game. Unable to change the tide for Leeds.
Photo by Mike Hewitt/Getty Images.
8. Pablo Hernandez
4 - Dropped deep to try and dictate, played some nice passes but couldn't hurt Crawley where it mattered. Had little impact after the break.
Picture by Adam Davy/PA Wire.
9. Helder Costa
3 - Ineffective. His touch was poor at times and his decision making wasn't much better. Wasted moments of good possession.
Picture by Adam Davy/PA Wire.
10. Ian Poveda
7 - The brightest spark on a dark day and yet he found himself substituted. Some nice tricks, dribbles and Leeds' only shot of note.
Picture by Simon Hulme.
11. Rodrigo
5 - Some nice movement, a shot on the turn and bits of link up play but he was well marshalled by the Crawley defence. Off at the break.
Photo by GLYN KIRK/AFP via Getty Images.
12. Oliver Casey (sub)
4 - Looked shaky as Crawley attacked in the second half with balls over the top and pace. Photo by Mike Hewitt/Getty Images.