Which player has had more singles appearances, Casey Dellacqua or Olga Morozova? 
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. Olga Morozova:  She was the runner up in singles at the 1974 French Open and 1974 Wimbledon Championships.
i don't know