In a span of 24 hours, Shawn Stefani shot rounds of 85 and 69 at Merion. A 16-shot swing from day-to-day is just the most recent example of U.S. Open treachery.
On Saturday, Stefani played his first 10 holes in 13-over, and went out in 47!! on an asbolutely horrid front nine at Merion's East Course. The day-to-day contrast is pretty remarkable, yanno, for someone who plays golf for a living. Look at all the colors and crooked numbers (via PGATour.com):
A 47 -- that might actually, maybe could, just possibly be a number that some weekend high single digit hacker could turn in. Of course, this shot on Sunday into Merion's extremely long par-3 17th is a shot that a weekend chop probably couldn't make:
An that's how you go from 15-shots over par one day to 1-under par the next.