Bobby Jones completed his revered Grand Slam of winning four major championships in the same year – 1930 US Open
on September 27, 1930 On this day in 1930, Bobby Jones completed his revered Grand Slam of winning four major championships in the same year. The four were the U.S. Open, The Open (or British Open), and U.S. Amateur and The Amateur. Jones was the first and only golfer in history to win the four big events of his time in the same calendar year.