NatF
Bionic Poster
I would say Courier is my cut off point, reason being he won 4 majors, had a brief period of dominance, and was the first guy since Laver to make all 4 slam finals in a year ('93).
Courier didn't make the USO final in 1993. He did reach the final of every slam in his career though obviously, though Edberg accomplished the feat earlier e.g. the 1991 USO, where as Courier had to wait until Wimbledon 1993 to complete the set.