Question: Which former tennis player is Australian, Geoff Masters or Eugenia Maniokova?
Context: Juan Mónaco (] ; born 29 March 1984), nicknamed "Pico", is a male former tennis player from Argentina.  He won nine singles titles, reached the semifinals of the 2010 Shanghai Masters and the 2012 Miami Masters, and achieved a career-high singles ranking of world no. 10 in July 2012.  He announced his retirement from professional tennis on 15th May, 2017. Haroon Rahim, (born 12 November 1949) is a Pakistani former tennis player.  The former Pakistan and Asian No. 1, Rahim was the youngest tennis player ever to play for Pakistan in the Davis Cup at 15 years of age.  He was also the highest ranking Pakistani tennis player ever (a career-high singles ranking of World No. 44 in July 1977).  He led the UCLA team to victory with Jeff Borowiak and Jimmy Connors in 1970–71 and was 1971 NCAA doubles champion with Jeff Borowiak. Stefanie Maria "Steffi" Graf (] ; born 14 June 1969) is a German former tennis player, who was ranked world No. 1 during her career.  Graf won 22 Grand Slam singles titles.  Her 22 singles titles put her second on the list of Major wins in the female competition since the introduction of the Open Era in 1968 and is third all-time behind Margaret Court (24) and Serena Williams (23).  In 1988, she became the first and only tennis player (male or female) to achieve the Golden Slam by winning all four Grand Slam singles titles and the Olympic gold medal in the same calendar year.  Furthermore, she is the only tennis player to have won each Grand Slam event at least four times. Anastasiya Andreyevna Myskina (Russian: Анастасия Андреевна Мыскина ; ] ; born 8 July 1981) is a Russian former tennis player.  She won the 2004 French Open singles title, becoming the first Russian female tennis player to win a Grand Slam singles title.  Subsequent to this victory, she rose to No. 3 in the WTA rankings, becoming the first Russian female tennis player to reach the top 3 in the history of the rankings.  In September 2004, she reached a career-high ranking of No. 2.  She has not officially retired, but has been inactive on the WTA Tour since May 2007. Eugenia Aleksandrovna Maniokova (Russian: Евгения Александровна Манюкова ; born 17 May 1968) is a retired professional tennis player from the Russian Federation.  She is a former World No. 18 in doubles. Nicolás Alejandro Massú Fried (born October 10, 1979), nicknamed "El Vampiro" (Spanish: "the vampire"), is a Chilean former tennis player, a former World No. 9 in singles, and a winner of two Olympic gold medals.  He is the only male player to have won both the singles and doubles gold medals during the same games in modern Olympic tennis (since 1988), the only two gold medals Chile has won at the Olympics.  Massú also reached the final of the 2003 Madrid Masters and won six singles titles. Geoff Masters (born 19 September 1950) is an Australian former tennis player.  He was part of doubles winning pairs in the US Open, Australian Open and Wimbledon tournaments during the 1970s. Daniel Vacek (born 1 April 1971) is a former tennis player from Czechoslovakia and the Czech Republic who turned professional in 1990.  He reached the quarterfinals of the 1995 Paris Masters, the 1998 Canada Masters and the 1998 Cincinnati Masters, and achieved a career-high singles ranking of World No. 26 in January 1996. Dimitar Kuzmanov (Bulgarian: Димитър Кузманов , ] ; nickname: Miko; born 28 July 1993) is a Bulgarian professional tennis player and the current No. 3 Bulgarian in the ATP singles ranking.  His highest singles ranking was No. 281 (8 February 2016), whilst his best doubles ranking was No. 445 (8 February 2016).  Kuzmanov is a player of Tennis Club Lokomotiv Plovdiv and is coached by former Bulgarian tennis player Stefan Rangelov and by Bulgaria Fed Cup team's former tennis player and present captain Dora Rangelova.  In 2011 he was invited to play for Bulgaria Davis Cup team. Manuela Maleeva-Fragniere and Leila Meskhi were the defending champions.  Maleeva-Fragniere retired from tennis earlier that year, but only Meskhi competed that year with Eugenia Maniokova.
Answer: Geoff Masters