Here are the four golfers who share the record:
- Vijay Singh: Second round, 2003 U.S. Open, Olympia Fields
- Jack Nicklaus: First round, 1980 U.S. Open, Baltusrol
- Tom Weiskopf: First round, 1980 U.S. Open, Baltusrol
- Johnny Miller: Fourth round, 1973 U.S. Open, Oakmont
That first 63 by Miller is often ranked as one of the handful of greatest rounds in golf history because it wasn't just the first 63 at a U.S. Open - it was the first 63 in any major. It happened in the final round of the 1973 U.S. Open and propelled Miller to victory.
Nicklaus and Weiskopf matched 63s in the first round of the 1980 U.S. Open, a tournament Nickklaus went on to win.