John McEnroe,Billy Jean King,Ozzie Smith,Rickey Henderson,Bob Gibson,Larry Bird, Magic Johnson,and Roger Staubach, to name a few.
Answer 2As you have placed this in Basketball, hockey and OZ footy categories, we need to refer mainly to those sports:
Larry Bird, Kareem Abdul in US basketball...
Len Thompson, John Greening, Wayne Richardson, Alex 'Jezza', Ian Stewart, Peter McKenna, Peter Hudson, etc in the early 70's in Australian football.
Brian Glencross and Ric Charlesworth in Australian hockey. Each of these went on to, later, coach Gold Medal winning Olympic hockey teams.
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Both, Ric Charlesworth and Brian Glencross, were stars in Australian Field Hockey during the early 1970's. Each of these champions went on to later coach Olympic Gold performance hockey teams.
I am not sure on cyclists in the early 1970's, but top Australian footballers during those times included John Greening, John Nicholls, Alex Jesaulenko, Peter McKenna, Peter Hudson, Len Thompson, Ian Stewart, Ken Fletcher [father of Dustin].