ACCELERATE UNDER THE BALL
To hit a greenside bunker shot, the big thing is to get your swing speed in the right place. Amateurs tend to swing back fast, probably because they hate these shots, then decel coming down and bury the club in the sand. I try to make a longer, slower swing that builds speed through the sand (right). I think of Fred Couples: His bunker swing has no speed going back and tons of it under the ball.
The other thing you need is clubface loft to push the ball up and out. Open the face at address, and play the ball up by your front foot. From there, make that long, relaxed swing that’s speedy at the bottom. I tell guys in pro-ams who can’t play a bunker shot to hit it fat with a really big swing. It works.