Anthony Wilding defeated Ernie Parker 6–1, 7–5, 6–2 in the final to win the men's singles tennis title at the 1909 Australasian Championships. It was Wilding's second Australasian singles title after 1906. The event was held on the grass courts of the Zoological Gardens in Perth.
|1909 Australasian Championships|
|Score||6–1, 7–5, 6–2|
- Q = Qualifier
- WC = Wild card
- LL = Lucky loser
- r = Retired
|First round||Second round||Semifinals||Final|
|R. Eagle||w/o||R. Eagle||0||1||0|
|I. Gaze||6||5||1||6||6||I. Gaze||1||0||0|
- ^ "Lawn Tennis". Western Mail. 23 October 1909. p. 37 – via National Library of Australia.
- ^ "Lawn Tennis Tournament". Daily News. 26 October 1909. p. 3 – via National Library of Australia.