Question: Who, Geoff Masters or Mary Carillo,  is an Australian former tennis player?
Context: This is a list of the main career statistics of Australian former tennis player Ken Rosewall whose playing career ran from 1951 until 1978.  He played as an amateur from 1951 until the end of 1956 when he joined Jack Kramer's professional circuit.  As a professional he was banned from playing the Grand Slam tournaments as well as other tournaments organized by the national associations of the International Lawn Tennis Federation (ILTF).  In 1968, with the advent of the Open Era, the distinction between amateurs and professionals disappeared and Rosewall was again able to compete in most Grand Slam events until the end of his career in 1978.  During his career he won eight Grand Slam, 15 Pro Slam and three Davis Cup titles. 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. This is a list of the main career statistics of Australian former tennis player Rod Laver whose playing career ran from 1956 until 1977.  He played as an amateur from 1956 until the end of 1962 when he joined Jack Kramer's professional circuit.  As a professional he was banned from playing the Grand Slam tournaments as well as other tournaments organized by the national associations of the International Lawn Tennis Federation (ILTF).  In 1968, with the advent of the Open Era, the distinction between amateurs and professionals disappeared and Laver was again able to compete in most Grand Slam events until the end of his career in 1977.  During his career he won eleven Grand Slam, nine Pro Slams and five Davis Cup titles. Mary Carillo (born March 15, 1957) is an American sportscaster and former professional tennis player.  She is a reporter for NBC Sports and NBC Olympics. John Hillebrand is an Australian former tennis player who was active from the late 1950s until the early 1970s.  He is currently living in San Pedro, California.  He had met Dale Jensen in London and upon arriving in California called him and wanted help to relocate there.  Dale arranged for him to immediately play a Senior tournament in Costa Mesa, where he met Dr. Jim Pugh, a Dentist, and fine Tennis Player.  They immediately became good friends.  Jim sponsored John in the US and had him teach his son, Jim. Patricia Coleman (born 13 May 1953) is an Australian former tennis player.  She played in the Australian Open singles from 1971 to 1974.  In 1972 she reached the final of the doubles event at the Australian Open with Karen Krantzcke. 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. The Djokovic–Nadal rivalry is between tennis players Novak Djokovic and Rafael Nadal, who are engaged in a modern-day tennis rivalry.  The rivalry is the most prolific of the Open Era.  The two have faced each other 50 times with Djokovic leading 26–24.  Between 2006–2010, this rivalry was often overshadowed by the historic Federer–Nadal rivalry, but it started to become widely recognized after they played their first Grand Slam final against each other at the 2010 US Open.  The first half of the rivalry was dominated by Nadal (who led 16–7 after the 2010 season) while the second half has been dominated by Djokovic, winning 11 out the last 13 matches.  It is widely considered to be one of the greatest rivalries in tennis history.  It was the first rivalry to involve meetings at all 4 Grand Slam finals (including four consecutive Grand Slam finals) and a record 26 Masters Series matches.  Their 2012 Australian Open final is considered to be one of the greatest matches of all time, and Mary Carillo and John McEnroe both commented that that Australian Open match and the 2013 French Open semi-final match were the two best matches played on hard and clay courts respectively.  The Djokovic–Nadal rivalry was listed as the third greatest rivalry in the last decade in 2009 by "ATPworldtour.com" despite its only starting in 2006. Frederick Sydney Stolle, AO (born 8 October 1938) is an Australian former tennis player and commentator.  He was born in Hornsby, New South Wales, Australia.  He is the father of former Australian Davis Cup player Sandon Stolle. Richard Crealy (born 18 September 1944) is an Australian former tennis player most notable for reaching the finals of the Australian Open in 1970, being a member of the 1970 Australian Davis Cup Team, and winning four Grand Slam titles in doubles.
Answer: Geoff Masters