On the back nine in the final round, Goalby birdied 13 and 14 and eagled 15 to record a 66 (−6) and a total of 277 (−11). At first it appeared that he had tied Roberto DeVicenzo and the two would meet in an 18-hole Monday playoff, but DeVicenzo, the reigning British Open champion, returned an incorrect scorecard showing a par 4 on the 17th hole, instead of a birdie 3, sunk with a two-foot putt. Playing partner Tommy Aaron incorrectly marked the 4 and DeVicenzo failed to catch the mistake and signed the scorecard. USGA rules stated that the higher written score signed by a golfer on his card must stand, and the error gave Goalby the championship.
Jack Nicklaus tied for fifth place and third round leader Gary Player finished tied for seventh. Lee Trevino, 28, made his Masters debut and was two strokes back after three rounds, tied for seventh place. A rough back nine of 43 (+7) pushed his score to 80 and he finished tied for 40th. Two months later, he won the 1968 U.S. Open, the first of his six major titles.
Arnold Palmer, 38, shot a second round 79 for a 151 and missed the cut at the Masters for the first time.