Question: Which tennis player, Tatiana Golovin and John Newcombe, boasts a highest singles ranking of 12?
Context: John David Newcombe, AO, OBE (born 23 May 1944) is a former tennis player from Australia who is one of the few men to have attained a world No. 1 ranking in both singles and doubles.  At the majors he won seven singles titles and an all-time record 17 men's doubles titles.  He also contributed to five Davis Cup titles for Australia during an age when Davis Cup was deemed as significant as the majors.  "Tennis" magazine rated him the 10th best male player of the period 1965–2005. Richard Gasquet (] ; born 18 June 1986) is a French professional tennis player who is currently ranked world No. 30 in men's singles by the Association of Tennis Professionals (ATP).  He won the mixed doubles Grand Slam title at the 2004 French Open, partnering Tatiana Golovin.  He also won an Olympic bronze medal in 2012 with his doubles partner Julien Benneteau.  His career-high singles ranking is world No. 7, achieved in July 2007.  In singles, his best achievements in Grand Slams are reaching the semifinals of the 2007 and 2015 Wimbledon Championships and the semifinals of the 2013 US Open.  Gasquet is best known for his long-winding groundstrokes and his one-handed backhand. 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. Tomáš Cibulec (born 15 January 1978 in Havířov, Czechoslovakia, now Czech Republic) is a retired professional Czech tennis player who turned professional in 1996.  Cibulec reached his highest singles ranking on 3 August 1998, becoming world number 646.  His highest doubles ranking is world number 21, which he reached on 17 March 2003.  A winner of three ATP doubles titles, Cibulec resides in Havířov, the city of his birth.  Jindrich and Anna Cibulec are his parents.  Before Cibulec became a professional, he became a tennis player at when he was seven.  He liked Stefan Edberg and Czechoslovak Miloslav Mečíř as a child.  He likes clay and feels his volley as his strength. Jorge Lozano (born 17 May 1963 in San Luis Potosí) is a retired professional tennis player from Mexico.  He reached his highest doubles ranking of World No. 4 in August 1988.  His highest singles ranking was World No. 51, achieved the following month.  During his career, he won two mixed doubles titles at the French Open: in 1990 with Arantxa Sánchez, and in 1988 with Lori McNeil.  He reached the round of 16 in singles at the 1988 US Open and also the semifinal in doubles that same year.  Qualified twice for the Doubles Masters at the Royal Albert Hall in London and reached the semifinals in 1988.  In his career, he won nine doubles titles, but no singles titles.  He turned professional in 1986, and in his career, he won $U.S.739,424 in prize money.  He was the first player to be beaten by Pete Sampras in the main draw of a Grand Slam tournament, at the French Open in 1989.  In Davis Cup play, represented Mexico for 15 years, 1981–1995, won 12 doubles matches, and lost 12 as well.  He lost 11 singles matches, and won 8, making his overall win / loss record at the Davis Cup 20–23.  Lozano won his first title at Forest Hills in 1988, with his partner Todd Witsken, and won his last at Athens in 1993.  He resides in Guadalajara, Mexico where he directs a tennis academy for kids and also coaches the men and women tennis team at the University Tec de Monterrey.  He is currently the captain of the Mexican Davis Cup Team. Tatiana Golovin (Russian: Татья́на Григорьевна Голови́на , "Tatyana Grigoryevna Golovina" ; born 25 January 1988) is a Russian-born French retired professional tennis player.  She won the 2004 French Open mixed doubles event with Richard Gasquet, and reached the singles quarterfinal at the 2006 US Open, losing to the eventual champion Maria Sharapova.  Her highest singles ranking to date is 12.  In 2008, she was diagnosed with lower back inflammation and was forced to stop playing competitive tennis indefinitely. Bruno Fraga Soares (] ; born February 27, 1982, in Belo Horizonte) is a professional tennis player from Brazil.  His highest singles ranking on the ATP Tour is World No. 221, which he reached in March 2004.  Primarily a doubles specialist, his career-high doubles ranking is World No. 2, which he achieved in October 2016.  After a few efforts, including a final in the 2012 US Open and the semifinals of the 2008 and 2013 French Opens, Soares finally won his first Grand Slam title at the 2016 Australian Open, partnering Jamie Murray and then followed that up with a second men's doubles title at the 2016 US Open.  He has also won three Grand Slam titles in Mixed Doubles, two at the US Open, in 2012 and 2014, and one at the Australian Open in 2016.  He was the third Brazilian tennis player to achieve this, after Maria Bueno and Thomaz Koch. Tina Pisnik (born 19 February 1981) is a former professional Slovenian tennis player.  Pisnik turned professional since 1999.  Pisnik's highest singles ranking was World Number 29, of which she reached on 12 January 2004.  Her highest doubles ranking was World Number 63, on 3 April 2000.  She won 1 singles title and 2 doubles titles on the WTA tour. Teryn Ashley-Fitch (born December 12, 1978) is an American professional tennis player.  Ashley won 17 titles in her career – 4 in singles and 13 in doubles.  Her highest singles ranking is World No. 95, which she achieved in July 2004.  Her highest doubles ranking is No. 59, achieved in October 2003. The 2008 Bausch & Lomb Championships – Singles was the singles event of the 2008 Bausch & Lomb Championships, a WTA Tier II tennis tournament held in April.  Tatiana Golovin was the defending champion, but withdrew from this year's event with injury.  Maria Sharapova defeated Dominika Cibulková in the final to become the 2008 champion.  This was Sharapova's 19th career singles title but the first she had won on clay courts.
Answer: Tatiana Golovin