Question: Who won more championship titles (either Grand Slam or Masters 1000), Thomas Muster or Betty Stöve?

Context paragraphs:
2009 Shanghai ATP Masters 1000: The 2009 Shanghai ATP Masters 1000 (also known as the 2009 Shanghai ATP Masters 1000–presented by Rolex) was a tennis tournament played on outdoor hard courts.  It was the 1st edition of the Shanghai ATP Masters 1000, and was classified as an ATP World Tour Masters 1000 event on the 2009 ATP World Tour.  It was played at Qizhong Forest Sports City Arena in Shanghai, People's Republic of China.  The inaugural edition was held from October 11 to October 18, 2009.

Jim Courier: James Spencer Courier Jr. (born August 17, 1970) is an American former World No. 1 professional tennis player.  During his career, he won four Grand Slam singles titles, two at the French Open and two at the Australian Open.  He holds the record for being the youngest man to have reached the finals of all four Grand Slam singles tournaments, at the age of 22 years and 11 months.  He also won five Masters 1000 series titles.  Until Novak Djokovic in 2016, Courier was the last man to win both the Australian and French Opens in the same calendar year.

David Ferrer: David Ferrer Ern (] ; (] ; born 2 April 1982) is a Spanish professional tennis player who is currently ranked world No. 26 in men's singles by the Association of Tennis Professionals (ATP).  A three-time Davis Cup champion with Spain, Ferrer has won tournaments at all levels (ATP 250, ATP 500, Masters 1000) except at a Grand Slam, and currently has the 7th highest career prize money earnings of all time.  Ferrer also holds the distinction of winning the most matches on the ATP tour without having won a Grand Slam tournament, passing Brian Gottfried who held this record for 32 years.

Fred McNair: Frederick V. McNair IV (born July 22, 1950 in Washington, D.C.) is a former professional tennis player from the United States who reached the World No. 1 doubles ranking in 1976.  That year, he teamed up with Sherwood Stewart to capture the men's doubles titles at French Open, the German Open and the Masters.  McNair was also a mixed doubles runner-up at the French Open in 1981, partnering Betty Stöve.  In 1978, he was a member of the US team that won the Davis Cup.  In nine years on the professional tour, McNair won 16 doubles titles.  His career-high singles ranking was World No. 67.

Stan Wawrinka career statistics: This is a list of the main career statistics of Swiss professional tennis player, Stan Wawrinka.  To date, Wawrinka has won sixteen ATP singles titles, including three Grand Slam singles titles at the 2014 Australian Open, the 2015 French Open, and the 2016 US Open, and one ATP Masters 1000 title at the 2014 Monte-Carlo Rolex Masters.  He was also a semifinalist at the 2013 US Open, the 2015 Australian Open, the 2015 US Open, and the 2013, 2014 and 2015 ATP World Tour Finals.  He also has reached the quarterfinals at 2014 and 2015 Wimbledon.  Wawrinka also won a gold medal partnering Roger Federer in men's doubles for Switzerland in the 2008 Summer Olympics in Beijing, beating Swedish team Simon Aspelin and Thomas Johansson.  In 2014 Wawrinka was part of the Swiss National Team, winning the Davis Cup for the first time.

Betty Stöve: Betty Stöve (born 24 June 1945) is a Dutch former professional tennis player.  She is best remembered for reaching the ladies' singles final at Wimbledon in 1977.  She also won ten Grand Slam titles in women's doubles and mixed doubles.

Williams sisters: The Williams sisters are two professional American tennis players: Venus Williams (b. 1980), a seven-time Grand Slam title winner (singles), and Serena Williams (b. 1981), twenty-three-time Grand Slam title winner (singles), both of whom were coached from an early age by their parents Richard Williams and Oracene Price.  There is a noted professional rivalry between them – between the 2001 US Open and the 2017 Australian Open tournaments, they met in nine Grand Slam singles finals.  They became the first two players, female or male, to play in 4 consecutive grand slam singles finals from the 2002 French Open to the 2003 Australian Open; Serena famously won all 4 to complete the first of two "Serena Slams".  Between 2000 and 2016, a 17-year span, they collectively won 12 Wimbledon singles titles (Venus won 5 and Serena won 7).  By winning the 2001 Australian Open women's doubles title, they became the 5th pair to complete the Career Doubles Grand Slam and the only pair to complete the Career Doubles Golden Slam.  At the time, Venus and Serena were only 20 and 19 years old, respectively.  Since then they have gone on to add another two Olympic gold medals in the 2008 Beijing Olympics and the 2012 London Olympics.  Nearly a decade later, the duo would go on to win 4 consecutive grand slam doubles titles from 2009 Wimbledon through 2010 Roland Garros, which would catapult them to co-No.  1 doubles players on 7 June 2010.  Two weeks later, on 21 June 2010, Serena would hold the No. 1 singles ranking and Venus would be right behind her at No. 2 in singles.  Their most recent grand slam doubles titles came at the 2012 Wimbledon & 2016 Wimbledon events.  They remain very close, often watching each other's matches in support, even after one of them has been knocked out of a tournament.

Thomas Muster: Thomas Muster (born 2 October 1967) is a former World No. 1 tennis player from Austria.  One of the world's leading clay court players in the 1990s, he won the 1995 French Open and at his peak was known as "The King of Clay."  In addition, he won eight Masters 1000 series titles.  Muster is one of only three players to win Masters titles on the three different surfaces of clay, carpet, and hard court.

Lleyton Hewitt career statistics: This is a list of the main career statistics of Australian tennis player, Lleyton Hewitt.  To date, Hewitt has won thirty ATP singles titles including two grand slam singles titles, two ATP Masters 1000 singles titles and two year-ending championships.  He was also the runner-up at the 2004 Tennis Masters Cup, 2004 US Open and 2005 Australian Open.  Hewitt was first ranked World No. 1 by the Association of Tennis Professionals (ATP) on November 19, 2001.

1980 US Open – Women's Doubles: Betty Stöve and Wendy Turnbull were the defending champions but they competed with different partners that year, Stöve with Pam Shriver and Turnbull with Rosemary Casals.

Supporting paragraphs: Thomas Muster Betty Stöve
Answer: Betty Stöve