史上初のキャリア・グランドスラム達成者は誰

The term "Grand Slam" was first applied to Bobby Jones' achievement of winning the four major golf events of 1930: The Open Championship, the U.S. Open, the U.S. Amateur and the British Amateur. When Jones won all four, the sports world searched for ways to capture the magnitude of his accomplishment. Up to that time, there was no term to describe such a feat because no one had thought it possible. The "Atlanta Journal"s O. B. Keeler dubbed it the "Grand Slam," borrowing a bridge term. George Trevor of the "New York Sun" wrote that Jones had "stormed the impregnable quadrilateral of golf." Keeler would later write the words that would forever be linked to one of the greatest individual accomplishments in the history of sports:
This victory, the fourth major title in the same season and in the space of four months, had now and for all time entrenched Bobby Jones safely within the 'Impregnable Quadrilateral of Golf,' that granite fortress that he alone could take by escalade, and that others may attack in vain, forever.
Jones remains the only man to have achieved the Grand Slam, since before the creation of The Masters and the advent of the professional era, the amateur championships were considered major championships.
The modern definition could not be applied until at least 1934, when the Masters was founded, and still carried little weight in 1953 when Ben Hogan won the Masters, U.S. Open, and Open Championship. That year, it was impossible to win all four as the PGA Championship preceded and overlapped with the Open Championship; the PGA's 36-hole match play semifinals and finals near Detroit were the same days as the mandatory 36-hole qualifier at Carnoustie in Scotland for the Open Championship; the only way to compete in both events was to lose an early match at the PGA. Hogan is the only player to have won the Masters, U.S. Open, and Open Championship in the same calendar year.
Bobby Jones