First off, congratulations to the Illinois men and the Duke women on their victories at the East Lake Cup (And also congrats to the Chicago Cubs for breaking their 108-year win drought at the World Series!)
And now for a quick refresher on how to "strike the match" when you hit a sand shot. This Golf Digest video from Martin Hall is a couple of years old, but I like the way he teaches the "strike" in this one. I don't think I've ever actually HEARD the strike as clearly as I do in this one.
I would suggest you try this at home, using a plastic-covered cushion. That's what Hall is using; if you can find one of those old sleeping mats like the ones kids used for nap time in elementary school, that would be perfect. But any kind of cushion with a slick surface should work.
Once you can get that little "zipping" sound Hall gets, you've got this technique down.