Although a number of players have completed three of the four, there are only four players who have won all four titles in their playing career.
Leslie's first success in the Strokeplay Championship came in 1975, followed by further wins in 1983, 1989 and 1990.
His single success in the Champion of Champions came in 1978 and he became the first player to complete the 'Grand Slam' when he won the Doc Thom salver in 1983.
The following year, 1984, former Scotland internationalist J. Allan Thomson of Ayr Belleisle GC won his only Matchplay title to complete the career 'Grand Slam', having won the Champion of Champions Trophy in 1979, two Strokeplay Championships in 1978 and 1991 and seven Order of Merit titles in 1980, 1982, 1984, 1985, 1986, 1988 and 1991.
It would be another 26 years before another player completed the quadralateral of all four major mens' Ayrshire titles, when Tommy McInally of Loudoun Gowf Club won the Doc Thom Salver for the Order of Merit in 2010, which added to his Matchplay Championship success in 2006, three Strokeplay championships in 2003, 2010 and 2015 and five Champion of Champions Trophy wins in 2003, 2004, 2005, 2009 and 2010.
And so to 2019 and the fourth player to achieve wins in all four County 'Majors'. Michael Smyth of Royal Troon won the first of his four Matchplay Championship titles in 2011, with further wins in 2013, 2015 and 2018 and won the first of his two Order of Merit titles the same year, 2011, which he followed with another Doc Thom salver win in 2017 when he also had his one Champion of Champions Trophy win to date. After losing in a play off for the Strokeplay Championship in 2011, success in a similar play off for the 2019 championship saw Michael join Leslie, Allan and Tommy in a select band of golfers in Ayrshire. .