Majors won is just one criteria, perhaps it is the most or one of the most important ones but it is still just one facet of a career. Obviously defining what a major is across various era's is very difficult, do we go by format and draw? Or do we consider only the top 4 tournaments of any year majors for simplicity and to be fair?
There were lots of various big events in the early Open Era this is true. Weighting them is of course difficult. Sometimes I think it would be useful to have tiers for majors to differentiate without assigning exact values. But there's so much subjectivity.
My issue with the pro majors is that the field lacked depth, in a pro type field would there have been a Del Potro at the USO in 2009? A Cilic at the USO in 2014? Would Djokovic have encountered a Querrey at Wimbledon this year? Would Wawrinka have been in the pro's in 2014 to stop Djokovic at the AO?
I prefer not to compare major title hauls from earlier era's than 1990 to now personally.
Thanks for your friendly words Bobby and the information about the French Pro. The French Pro in 1968 had a really good draw and Mccauley includes 1968 in his history of professional tennis. So I'm on the fence with regards to including it as a 'major'. Again as I said to pc1 it depends on whether draw/format determines what is a major or if it's due to status relative to other events.
Of course, the term "Pro Major" was not used during the old pro era, it is a term which was invented years after open tennis came along, probably in an attempt to construct an equivalent with which to puff the numbers of those great players who spent much of their time in the split era pro field.
Further, it is now clear that the old Forest Hills Tournament of Champions was the most prestigious and media central event in the late 1950s, and the 1967 Wimbeldon Pro was the most prestigious event of its era, both events offering the highest paycheques of their respective seasons.
These events should certainly be regarded as pro majors, a term whcih was created well after the fact.