How did the major tournaments in Bobby Jones's Grand Slam differ from the modern professional majors?

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When Bobby Jones achieved the Grand Slam in 1930, the four tournaments that constituted the feat were different from the modern professional majors.1

Jones’s 1930 Grand Slam consisted of the following four events:
* British Open (Open Championship)
* U.S. Open
* British Amateur Championship
* U.S. Amateur Championship

In the modern era, the two amateur championships have been supplanted by the PGA Championship and the Masters Tournament to form the current professional Grand Slam. While Jones was an amateur who never turned professional, the modern professional majors are defined by their status within the professional circuit, which evolved significantly as prize money grew from the late 1930s onward.12