Casey Dellacqua ( d?-LAK-w?; born 11 February 1985) is a retired Australian professional tennis player.
Dellacqua's best singles results on the WTA Tour have been semifinal appearances at the 2012 Texas Tennis Open and 2014 Birmingham Classic, a quarterfinal finish at the 2014 Indian Wells Masters and fourth round appearances at the 2008 Australian Open, the 2014 Australian Open and the 2014 US Open; she has also won 22 ITF singles titles.
Dellacqua's career highlights, however, have all come in doubles.
She has won seven WTA doubles titles, 23 ITF doubles titles, and one Grand Slam mixed doubles title at the 2011 French Open.
She has reached the finals of all four Grand Slam events in women's doubles, appearing in seven major finals from 2008 to 2017, however has yet to win a Major title.
Dellacqua won her biggest women's doubles title at the Premier Mandatory 2015 Mutua Madrid Open, partnered with Yaroslava Shvedova.
Dellacqua achieved her career-high singles ranking of world No.
26 in September 2014, and career-high doubles ranking of No.