Payers were forbidden to sit down at a change of ends, as they do now. Nor could they use any type of umbrella to protect
themselves from the blazing sun. Some stood, quaffing copious amounts of water, with a wet towel draped over their head, and
clinging to any shade caste by the umpire, who sat above them in an elevated umpire’s chair. It would have all been good training for
the Kokoda Trail.
.......Among the problems that referees and umpires had to adjudicate 50 years ago were cases of players cramping, a
frequent occurrence in Australia’s hot and steamy summer. Any player so afflicted could not receive medical treatment on court unless he or she defaulted. Some defied their pain and would writhe helplessly until obliged to give up. [This was true as late as 1965. In the final Maria Bueno's cries of pain on the ground due to cramps brought screams from a helpless crowd pleading for someone to step in. Officilas dared not touch her-as this brought an immediate default].
Certainly the sports medicine aspect --or lack thereof-- would have left so many modern players with much less of their careers. E.g., some of the treatments BJK had for her knees made the problems worse.