Jack Cummings (tennis)
Regner Olaf "Jack" Cummings 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.
Cummings turned professional in late 1935.| Result | Year | Championship | Surface | Opponent | Score |
| Loss | 1928 | Australian Championships | Grass |  Jean Borotra | 4–6, 1–6, 6–4, 7–5, 3–6 |
