Jack Burke Jr., a top player on the P.G.A. tour in the postwar years who won two major golf championships in one season, then became a sought-after instructor to some of golf’s greatest stars, has died at 100. He was the oldest living winner of the Masters and P.G.A. championships.

The United States Golf Association confirmed his death. The Associated Press said he died on Friday in Houston.

Burke’s banner year was 1956, when he won both the Masters and the P.G.A. titles and was named the P.G.A.’s golfer of the year.

His Masters victory surprised almost everyone.

Only weeks earlier, having gone winless since the Inverness open in Ohio in 1953, Burke, who was 33, had announced that he was considering retiring. And going into the final round at Augusta National Golf Club, he was eight strokes behind the Masters leader, Ken Venturi, and had not drawn much attention.