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. Olga Morozova:  She was the runner up in singles at the 1974 French Open and 1974 Wimbledon Championships.
i don't know