There is no doubt about it; the US PGA Championship does not have the prestige of the other three Majors. It is nevertheless a hugely important tournament.

The last of the big four to be held each year and therefore known as 'glory's last shot', it is staged in mid-August by the Professional Golfers' Association of America.

The tournament was inaugurated in 1916 as a national championship for the country's professionals at a time when affluent amateurs still held sway and it is now the only Major that allows no amateurs into its field.

With over 150 competitors, the world's best golfers are joined by many drawn from the ranks of America's club professionals and indeed the top 20 finishers in the PGA National Championship qualify for the tournament.

Originally unique among the Majors as a matchplay event, it switched to strokeplay in 1958 and in doing so secured its future with TV broadcasters, who naturally prefer a full field on the last day.

It used to be staged often at venues that can best be described as obscure, but PGA officials have protected its status by switching to the more celebrated courses, often those associated with the US Open.

If the PGA Championship is the weakest of the Majors, it has nevertheless proved an elusive catch for some of the game's greats, with the likes of Arnold Palmer and Tom Watson falling short of a Career Slam because of it.

It is noted, however, for producing first-time Major winners and has provided many memorable moments such as the fairytale success of the unknown John Daly in 1991.

Among golfers with only one Major to their name, and that the PGA Championship, are the likes of Paul Azinger and Davis Love III.