- Young Tom Morris*: 1868 British Open, 17 years 5 months 8 days
- John J. McDermott: 1911 U.S. Open, 19 years, 10 months, 14 days old
- Gene Sarazen: 1922 PGA Championship, 20 years, 5 months, 22 days
*Morris also won in 1869 and 1870 and was younger than McDermott in each of those years, too. Sarazen also won the U.S. Open in 1922, whe he was 20.
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