Only golfer ever to win the Grand Slam (U.S. Open, U.S. Amateur, Open Championship, British Amateur) in a single calendar year (1930); remained a lifelong amateur while regularly beating the best professionals.
"Jones is the one I bring up when a member asks whether they 'need' to turn pro to be great — he beat every pro of his era with a law degree in one hand and a hickory shaft in the other, then walked away at 28."
You don't need to turn pro to master the game — discipline, preparation, and composure under pressure carry as much weight as talent. Jones also retired at his absolute peak, at age 28.
Source: web verified · high confidence