Question: Mary Pierce and Shelby Cannon, share which occupation?

full_context: Document 1: 2000 du Maurier Open – Women's Doubles: The 2000 du Maurier Open – Women's Doubles was the women's doubles event of the one hundred and eleventh edition of the Canadian Open; a WTA Tier I tournament and the most prestigious women's tennis tournament held in Canada. Jana Novotná and Mary Pierce were the defending champions, but Novotná retired from professional tennis in 1999 and Pierce did not compete at the tournament. Martina Hingis and Nathalie Tauziat won the title by defeating Julie Halard-Decugis and Ai Sugiyama 6–3, 3–6, 6–4 in the final. It was the 11th title for Hingis and the 21st title for Tauziat in their respective doubles careers.
Document 2: Sherwood Stewart: Sherwood Stewart (born June 6, 1946, in Goose Creek, Texas, United States) played amateur and professional tennis in the 1970s and 1980s. Stewart was ranked as high as No. 60 in the world in singles on the ATP Rankings on December 31, 1978, and No. 4 in doubles on January 3, 1983.
Document 3: Pete Sampras: Pete Sampras (born August 12, 1971) is a retired American tennis player widely regarded as one of the greatest in the history of the sport. He was a right-handed player with a single-handed backhand and a precise and powerful serve that earned him the nickname "Pistol Pete". His professional career began in 1988 and ended at the 2002 US Open, which he won, defeating rival Andre Agassi in the final.
Document 4: Mary Joe Fernández: Mary Joe Fernández Godsick (born María José Fernández; August 19, 1971) is an American former professional tennis player. She reached a career-high ranking of world No. 4 in both singles and doubles. Fernández was the runner-up in three Grand Slam singles tournaments and won two Grand Slam women's doubles titles and two Olympic gold medals.
Document 5: Mary Pierce: Mary Pierce (born 15 January 1975) is a French retired tennis professional who played on the Women's Tennis Association (WTA) tour. Born in Canada, she is a citizen of Canada, and the United States. Pierce played for France in team competitions and in the Olympics.
Document 6: Shelby Cannon: Shelby Cannon (born August 19, 1966, in Hattiesburg, Mississippi) is an American retired professional tennis player.
Document 7: 1990 US Open – Mixed Doubles: Robin White and Shelby Cannon were the defending champions but lost in the second round to Zina Garrison and Rick Leach.
Document 8: Marion Bartoli: Marion Bartoli (] ; born 2 October 1984) is a French former professional tennis player. She won the 2013 Wimbledon Championships singles title after previously being runner-up in 2007 and was a semifinalist at the 2011 French Open. She also won eight Women's Tennis Association singles titles and three doubles titles. She announced her immediate retirement from professional tennis on 14 August 2013.
Document 9: Tim Wilkison: Tim Wilkison (born November 23, 1959 in Shelby, North Carolina, U.S.) is a former professional male tennis player from the United States.
Document 10: Sandrine Testud: Testud broke into top 20 singles rankings in July 1997. On February 7, 2000, she became the sixth Frenchwoman after Françoise Dürr, Mary Pierce, Nathalie Tauziat, Amélie Mauresmo and Julie Halard to break into the singles top 10 rankings. This marked the first time France had four women ranked in the singles Top 10 simultaneously (Mary Pierce at No. 5, Nathalie Tauziat at No. 6, Julie Halard at no.8 and Testud at No. 9). France was the third nation after the USA and Australia to have more than two representatives in the singles Top 10 at any one time. She finished in the top 20 singles rankings for five consecutive years between 1997 and 2001. In the summer of 2002, she took a break from the tennis circuit when she discovered that she was pregnant with her first child. She resumed her career 12 months after the birth of her child and retired in the summer of 2005.
Document 11: Jennifer Capriati: Jennifer Maria Capriati (born March 29, 1976) is an American former professional tennis player. A member of the International Tennis Hall of Fame, she won three singles championships in Grand Slam tournaments and a gold medal at the 1992 Summer Olympics in Barcelona, reached the World No. 1 ranking, and is considered one of the greatest tennis players of all time.
Document 12: Mary Carillo: 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.
Document 13: Althea Gibson: Althea Gibson (August 25, 1927 – September 28, 2003) was an American tennis player and professional golfer, and the first black athlete to cross the color line of international tennis. In 1956, she became the first person of color to win a Grand Slam title (the French Open). The following year she won both Wimbledon and the U.S. Nationals (precursor of the U.S. Open), then won both again in 1958, and was voted Female Athlete of the Year by the Associated Press in both years. In all, she won 11 Grand Slam tournaments, including six doubles titles, and was inducted into the International Tennis Hall of Fame and the International Women's Sports Hall of Fame. "She is one of the greatest players who ever lived," said Robert Ryland, a tennis contemporary and former coach of Venus and Serena Williams. "Martina couldn't touch her. I think she'd beat the Williams sisters." In the early 1960s she also became the first black player to compete on the women's professional golf tour.
Document 14: Tracy Austin: Tracy Ann Austin Holt (born December 12, 1962) is an American former World No. 1 retired professional tennis player. She won three Grand Slam titles, including the women's singles titles at the 1979 and 1981 US Opens, and the mixed doubles title at the Wimbledon Championships in 1980. Additionally, she won the WTA Tour Championships in 1980 and the year-ending Toyota Championships in 1981, both in singles. A series of injuries and a serious automobile accident cut short her career. Since 1979, she has been the youngest US Open female singles champion in history, and she is the youngest inductee of all time at the International Tennis Hall of Fame. Austin won singles titles on all playing surfaces: clay (both red clay and green clay), indoor carpet, grass, and hard courts.
Document 15: Zina Garrison: Zina Lynna Garrison (born November 16, 1963) is a former professional tennis player from the United States. During her career, she was a women's singles runner-up at Wimbledon in 1990, a three-time Grand Slam mixed doubles champion, and a women's doubles gold medalist and singles bronze medalist at the 1988 Olympic Games. She is currently coaching Taylor Townsend.
ground_truth: tennis professional