2021 RSM Classic leaderboard: PGA Tour single-round scoring average threatened in Round 1 at Sea Island

Multiple golfers approached golf's magic number of 59 on Thursday in Georgia

If you shot even par on Thursday at the RSM Classic, you have almost no hope of making it to the weekend in the last PGA Tour tournament of 2021.

Two courses are used for the first two rounds of this event, and both played well under par during Round 1. The average score at the Seaside Course — where leader Sebastian Munoz played his round and shot 10-under 60 — was 66.31, and the average score at the Plantation Course was 68.7. The Seaside number of 66.31 is the second-lowest scoring average on a single course in a single round on the Tour since 1983.

Even though Munoz was on the easier course, he still gained the most strokes of anyone on either course against their particular field (6.3) as the best scores on the Plantation Course (63s) only gained 5.7 strokes against their field. So Munoz holds the lead on the leaderboard and actually played the best golf of anyone in this tournament on Thursday relative to his field on his course. That's not always the case after the first round at tournaments with split courses.