Playbooks
In 13 playbooks
Breakdown
Cover 3 Sky is a zone coverage shell out of the 3-3-5 Over Flex set with Big Nickel 4-2-5 personnel, showing three deep zone drops from the outside corners and deep third safety while the underneath defenders carry curl-flat and hook zones. The diagram shows both outside linebackers or slot defenders sinking into curl-flat zones (the purple and gold routes breaking outside toward the numbers) while the two inside defenders drop into hook or curl zones underneath the deep thirds. This is a zone beater shutdown call designed to defend the entire field with three deep defenders splitting the field into thirds, and the primary read progression for the defense is to key the quarterback's eyes from the deep middle safety out to the strong side flat, driving on any route that settles into the flat or curl zone before the ball is thrown.
Defensive Reads
Read the quarterback's drop, a three step or five step drop into a quick game usually signals a hitch or flat route designed to attack the flat defender before he can sink. Watch the number two and number three receivers post snap, if they both break to the same flat or curl zone it is likely a flood or smash concept that overloads one side. Key the tight end or slot releasing vertically up the seam, since Cover 3 Sky's biggest weakness is the seam route splitting the hook defender and the deep third corner. Identify if the offense is running four verticals pre-snap based on receiver splits, because the deep third defenders must widen and stay on top rather than driving on any single route. Look for user pressure from a lurking linebacker sitting in the middle hook zone, as a good user player will rob any dig or crosser trying to sit down in the void between the underneath zones and the deep thirds.
Usage Tips
Call Cover 3 Sky on early downs or obvious run downs when you want a run support defender in the box while still protecting against play action shots. Check the pre-snap alignment of the offense's slot receivers, if they are bunched or stacked, be ready to pass off crossers with your underneath zone defenders using pattern match rules. Use the flat defender's user control to jump quick outs and hitches, since Cover 3 Sky is most vulnerable to the flat and curl zone getting attacked simultaneously by a smash concept. Pair this call with Cover 3 Buzz Mable or Cover 3 Match on subsequent snaps so quarterbacks cannot key the exact same deep third landmarks every time. Avoid this call on obvious passing downs against trips formations unless you bracket the number three receiver, since the seam and deep out can stress the flat defender's leverage.
