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Hall of Fame
Just Wiki-ed the field for the two AOs that JC won. With the exception of one retirement of Pete Sampras they are mightily powerful fields... absolutely dwarfing the joke fields we witnessed in 2017, for example.
I'll always consider the AO to be slightly less prestigious than the other three majors -- kinda like the PGA Championship in golf.
In any event, given the disparities in resumes, in order for Courier to have an argument he'd really have to have won on all 3 surfaces for that one extra major to really pull rank.