Which player has had more singles appearances, Casey Dellacqua or Olga Morozova? 
Casey Dellacqua: Casey Dellacqua (born 11 February 1985) is an Australian professional tennis player of Italian and Irish descent. Casey Dellacqua:  Dellacqua's best singles results to date have been semifinal appearances at the 2012 Texas Tennis Open and 2014 Aegon Classic, a quarterfinal finish at the 2014 BNP Paribas Open and fourth round appearances at the 2008 Australian Open, 2014 Australian Open and the 2014 US Open.
i don't know