at the end what matters is comparing weak to strong or medium eras
1920īs, 1960īs amateurs and 2000īs are weakest eras
1980īs and pros 1950īs are the toughest ever ones
1930īs and 1940īs are medium to low competitive eras
1970īs and 1990īs are medium to highly competitive eras
"Esther,Evonne,Hana,Martina: was it a fairy stick or a tennis racket?"