Robert Tyre ‘Bobby’ Jones Jr. was the dominant golfer of the 1920s — and he achieved it as an amateur, playing for love of the game while also maintaining a professional career as a lawyer.

Jones won 13 major championships between 1923 and 1930. In 1930, he accomplished something that no golfer before or since has matched: he won all four major championships in a single year — the US Open, the US Amateur, the British Open, and the British Amateur. This was called the Grand Slam.

After completing the Grand Slam at age 28, Jones retired from competitive golf. He simply stopped. He had nothing left to prove and, by his own account, no longer enjoyed the pressure of competition. He was at the peak of his abilities when he walked away.

Jones then channeled his love of the game into building what he considered the ideal golf course: Augusta National, which opened in 1933 and has hosted the Masters Tournament every year since 1934.