Regnar Olaf Jack Cummings or Ronald Cummings (1901 – 22 January 1972) was an Australian tennis player.Cummings finished runner-up to Jean Borotra at the Australian Championships the future Australian Open in 1928. He also reached the semifinals in 1931 and the quarterfinals in 1930. Cummings won the Queensland Championships in 1926 and 1930.
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