The Australian PGA treat some of these competitions, starting in 1905, as earlier editions of the same event.

Winners of the Sun-Herald Tournament, held from 1924 to 1926, and which had a similar format to the new championship, had been reported as being the "professional championship of Australia" and the winners called the "professional champion of Australia", although these were not necessarily official titles.

Rufus Stewart reached the final again 1930 but lost a close match to Jock Robertson.

[16] The final was between two of the New South Wales players, with Norman Von Nida beating Eric Cremin by one hole.

[21] In 1951 the qualifying system was changed, with the PGA Championship being played immediately after the Open.

[26] Ossie Pickworth won his second championship, beating Peter Thomson in a close final.

[27] The Open again acted as the qualifying event in 1954, although the PGA Championship was not played until 6 weeks later, Kel Nagle winning his second title.

[28][29] From 1955 to 1961 the PGA Championship was played the week after the Open, which acted as the qualifying event.

[41] Col Johnston beat the American Ron Howell in the final, which was played on a Sunday for the first time.

It has been played in that format to the current day, with the exception of 1973 when it reverted to match-play for a single season.

[43] Col Johnston won for the second year in succession, a stroke ahead of Bruce Devlin.

[47] Arnold Palmer and Jack Nicklaus competed in the 1968 championship, which was extended to four days with a Sunday finish.

However, 47-year-old Kel Nagle won the title for the sixth time, 6 ahead of Nicklaus with Bruce Devlin third, a further 5 strokes behind.

[56] Telecom dropped its sponsorship after a single event and Mayne Nickless became the sponsor from 1978 to 1982, all five tournaments being played at Royal Melbourne.

There were three overseas winners in this period, Hale Irwin in 1978, Sam Torrance in 1980 and Seve Ballesteros in 1981.

Greg Norman won in 1984 and 1985, both times by 8 strokes, and was runner-up in 1986, losing to Mike Harwood.

[65] From 1988 to 1990 the championship was held at the Riverside Oaks club outside Sydney with prize increasing to A$500,000 in 1989 and 1990.

In 1988 Wayne Grady beat Greg Norman after a sudden-death playoff, the first in the championship's history.

[71] Reebok sponsored the event at the New South Wales club in 1994, prize money being reduced to A$200,000.

Phil Tataurangi won in 1996, having started the last round eight strokes behind leader Chris Gray.

[75][76] The 1999 event was played at Victoria Golf Club with reduced prize money of A$300,000 and was won by Greg Turner.

[92][93] Nathan Holman won in 2015 after a playoff against Dylan Frittelli and Harold Varner III.

[96][97] The 2020 championship was cancelled because of the COVID-19 pandemic, while the 2021 event was rescheduled to January 2022, without European Tour co-sanctioning, at Royal Queensland with prize money of A$1,000,000.

[98] A second event was held in 2022, at Royal Queensland in November, as part of the 2023 European Tour season.

The first Australian Open finished on Saturday 3 September 1904, and the leading eight professionals in it played a knock-out competition on the following Monday and Tuesday.

In 1909 there was a tie between Fred Popplewell and Willie Thomson, while Dan Soutar won by 8 strokes in 1910.

The first, with prize money of £25, was played on the Monday following the Open and was won by Soutar, with Popplewell and Rufus Stewart runners-up.

The result was similar to the Monday event with Soutar winning, Stewart second and Popplewell third.

A 36 hole stroke-play qualifying stage was held on the Monday with the leading four playing match-play on the Tuesday.

[141] In 1921, Billy Iles, receiving 2 strokes, beat Arthur Le Fevre by 2 holes in the final.