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. 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.
Petra Kvitová Petra Kvitová (] ; born 8 March 1990) is a Czech professional tennis player. Known for her powerful left-handed groundstrokes and variety, Kvitová turned professional in 2006 and has won 20 career singles titles, including two Grand Slam titles at Wimbledon. She is also an Olympic medalist, capturing the bronze medal at the 2016 Rio Olympics. She reached her career-high ranking of world no. 2 on 31 October 2011 and as of 18 September 2017, is ranked world no. 14 by the Women's Tennis Association (WTA). As such, Kvitová is the current second highest-ranked Czech and the second highest-ranked left-handed player in the WTA behind Karolína Plíšková and Germany's Angelique Kerber, respectively.