Palmer did what in Grand Slam tourneys?

Today’s question: The great Arnold Palmer is one of the most famous and well-respected professional athletes of all time. Palmer won three stages of the Grand Slam of golf. Which leg of the Grand Slam did Palmer win the most and which did he fail to win?

Yesterday’s answer: Bob Mathias of the United States won the Olympic Decathlon in 1948 and 1952 and Daley Thompson from Great Britain won the gold medal in 1980 and 1984