Pat Mucci beat me to #10 @ Inwood. Yes, it is the shortest hole in U.S. Open history.
Tom Doak: The scorecard shows 98 yards.
All: #10 @ Inwood is a pretty good hole. First, it sits hard by Jamaica Bay and it about 2 miles from the ocean, so there is almost always enough breeze/wind to make you think hard about just throwing a distance wedge up into the air. Second, it's a two tier green, so, like #13 at Merion, missing long with a back flagstick = bogey 4 (or worse as there is water in front of the green). When the hole is cut down front, it's not so bad although even a halfway-decent ball striker can suck it back into the water if they're not careful.
I believe the "drop hole" at Pocono Manor East is 77 yards. Not sure it qualifies as a great hole although experience has taught me not to miss long (in the woods).
A shame that #6 at Merion West is 100+ yards and doesn't qualify. While not "two or twenty", it IS 2/3 or 4-6.