Who became the first player in the Open era to win each of the four Grand Slam tournaments at least twice?

Fact

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Novak Djokovic has won each of the four major tournaments at least twice in singles. By winning Roland-Garros in 2021, he became the first man in the Open era, which began in 1968, to complete this double Grand Slam in his career. He then increased some of his totals to three or more victories. Rod Laver, however, had already won each of the four majors at least twice, counting the years preceding the Open era; he even achieved two calendar Grand Slams, in 1962 and 1969.