Today's U.S. Open sectional qualifier is one of the most grueling days on the golf calendar. 36 holes are all that's left between being a qualifier and making it into the field. When the sun sets today, the field will be set for the 125th playing of the U.S. Open in two weeks at Oakmont Country Club.

Gaede previews the 10 sites and some of the names and stories to keep an eye on as the day unfolds.