See main article: 2009 Australian Open.
Serena and Venus Williams defeated Daniela Hantuchová and Ai Sugiyama in the final, 6–3, 6–3 to win the women's doubles tennis title at the 2009 Australian Open. It was their third Australian Open doubles title together and eighth major title together overall. Alona Bondarenko and Kateryna Bondarenko were the defending champions, but were defeated in the first round by Gisela Dulko and Roberta Vinci.