Question: Which tennis player won ten Grand Slam titles, Betty Stöve or Stan Smith?
Context: Kenneth Robert Rosewall {'1': ", '2': ", '3': 'AM, MBE', '4': "} (born 2 November 1934) is a former world top-ranking amateur and professional tennis player from Australia.  He won a record 23 tennis Majors including 8 Grand Slam singles titles and before the Open Era a record 15 Pro Slam titles and a record 35 Major finals overall.  He won the Pro Grand Slam in 1963.  Rosewall won 9 slams in doubles with a career double grand slam.  He is considered to be one of the greatest tennis players of all time.  He had a renowned backhand and enjoyed a long career at the highest levels from the early 1950s to the early 1970s.  Rosewall was one of the two best male players for about nine years and was the World No. 1 player for a number of years in the early 1960s.  He was ranked among the top 20 players, amateur or professional, every year from 1952 through 1977.  Rosewall is the only player to have simultaneously held Pro Grand Slam titles on three different surfaces (1962–1963).  At the 1971 Australian Open he became the first male player during the open era to win a Grand Slam tournament without dropping a set. Stanley Roger Smith (born December 14, 1946 in Pasadena, California) is a former world No. 1 American tennis player and two-time Grand Slam singles champion who also, with his partner Bob Lutz, formed one of the most successful doubles teams of all time.  Together, they won many major titles all over the world.  In 1970, Smith won the first year end championship Masters Grand Prix title.  Smith's two major singles titles were the 1971 US Open (over Jan Kodeš in the final), and 1972 Wimbledon (over Ilie Năstase in the final).  In 1972, he was the year-ending world No. 1 singles player.  In 1973, he won his second and last year end championship title at the Dallas WCT Finals.  In addition, he won four Grand Prix Championship Series titles.  His name is also used in a popular brand of tennis shoes.  In his early years he improved his tennis game through lessons from Pancho Segura and the Pasadena Tennis Patrons. Pam Teeguarden (born April 17, 1951) is a former American professional tennis player in the 1970s and 1980s, ranked in the top 20 from 1970–1975, according to "John Dolan's Women's Tennis Ultimate Guide", prior to computer rankings.  She won two Grand Slam Doubles Titles and was a quarter finalist in singles at the U.S. Open and The French Open.  Her father Jerry, a well known coach, helped Margaret Court win the coveted Grand Slam (all four Grand Slam titles in one year) in 1970 and Virginia Wade to her 1977 Wimbledon triumph.  Teeguarden was voted the "Most Watchable Player" based on play and appearance by a group of Madison Avenue advertising executives or "Mad Men" while playing at the US Open.  Teeguarden played in 19 consecutive US Opens, holding the record until Chris Evert played in 20.  She wore the first all black outfit in the history of tennis in 1975 at The Bridgestone Doubles Championships in Tokyo, starting a trend that is still popular today.  Teeguarden was the first woman tennis player signed by Nike.  She played on the victorious Los Angeles Strings Team Tennis team in 1981 and won the Team Tennis Mixed Doubles Division with Tom Gullikson in 1977; they were also runners-up in the league that year. 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. Cara Black (born 17 February 1979) is a professional tennis player from Zimbabwe.  She is primarily a doubles specialist, winning 60 WTA and 11 ITF titles in that discipline.  A former no. 1 ranked women's doubles player in the WTA Rankings, she has won ten Grand Slam titles in women's doubles and mixed doubles combined.  By winning the mixed doubles title at the 2010 Australian Open, Black became the third woman in the Open Era to complete a Career Grand Slam in mixed doubles (after Martina Navratilova and Daniela Hantuchová).  Having won one singles title on tour, she also peaked at no. 31 in the singles rankings in March 1999. 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. Larisa Savchenko-Neiland (née Savchenko; born 21 July 1966) is a former professional tennis player who represented the Soviet Union and Latvia.  A former world number one ranked doubles player, Neiland won two women's doubles Grand Slam titles and four mixed doubles Grand Slam titles.  She also won two singles titles and sixty-five doubles titles. William Tatem Tilden II (February 10, 1893 – June 5, 1953), nicknamed "Big Bill," was an American male tennis player.  He is often considered one of the greatest tennis players of all time.  Tilden was the World No. 1 player for six years from 1920 through 1925.  He won 15 Major singles titles including ten Grand Slam events, one World Hard Court Championships and four Pro Slam tournaments.  He was the first American to win Wimbledon in 1920.  He also won a record seven U.S. Championships titles (shared with Richard Sears and Bill Larned). Serena Williams's 2009 tennis season officially began at the 2009 Medibank International Sydney.  Williams finished the year ranked world no. 1 for the second time in her career, having played in 16 tournaments, more than any other year.  She also broke the record previously set by Justine Henin for the most prize money earned by a female tennis player in one year, with Williams earning $6,545,586.  In doubles, she finished the year ranked world no. 3, despite playing only six tournaments as a pair.  She won five Grand Slam titles, putting her total Grand Slam titles at 23. 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.
Answer: Betty Stöve