The National Library of Australia's flickr sport albums

The National Library of Australia has a flickr account.
There are two sport related albums that share images under creative commons licenses or with no known copyright restrictions:
Keen on cricket (21 photos)
Sports (16 photos)

Photo Credits

Don Bradman is almost run out at 101 in his innings of 169 in the fifth Test at the Melbourne Cricket Ground, 1936/37 Marylebone Cricket Club (MCC) tour of Australia (NLA, no known copyright restrictions)

Women’s hurdles race taking place at Sydney Sports Ground, New South Wales, March 1931. (NLA, no known copyright restrictions)