The South African shot an 8-under-62 Saturday, the lowest score ever in a major championship. Sometimes it helps not knowing these things. I didn't know 62 was the lowest ever but now it makes it even more special.
Grace even admitted in his post round interview that he had no idea of the history he had just made, "I didn't know on 18 what was going on".
"And I thought if I could make a couple more on the back nine, then it's going to be a great score".
While 31 men before him had shot a 63 at a major championship, Grace was the first in 157 years of major play to beat them by a stroke.
The OnePlus 5 has a bug that could actually kill people
The OnePlus 5 was one of the most promising Android handsets of the summer, at least on paper. Last month, users complained of a "jelly scrolling" issue plaguing the handset's display .
The 29-year-old was ranked 10th in the world a year ago but has struggled with his short game, falling to 35th entering this week. "I promise you", Grace added.
To make matters even more unbelievable, Grace did this after shooting 74 the round before during some brutally bad weather. This is the 12th time he has been atop the leaderboard at the end of a round in a major, including the final rounds of the Masters and U.S. Open that he won in 2015. But when he finished, he was just two off the lead with Jordan Spieth still waiting to tee off.
Successive gains from the eighth were followed by long-range birdies at the 14th and 16th, before Grace sealed his historic round with a two-putt gain at the 17th and close-range par at the last.
Grace - playing in the 13th pairing alongside Jason Dufner - went out in 29 to set up his bid for history. He made eight birdies with no bogeys to become the first player to shoot a 62 in the 442 major championships contested. But obviously I knocked in the two-footer or three-footer [for par].
"It's something I really enjoyed and something I'll remember forever, definitely", said the South African golfer after signing his card.