Question: Are Manuel Orantes and Anna-Lena Grönefeld both tennis players?

full_context: Document 1: Laura Siegemund: Laura Natalie Siegemund (born 4 March 1988 in Filderstadt) is a German professional tennis player.
Document 2: Mats Wilander: Mats Wilander (] ; born 22 August 1964) is a former World No. 1 tennis player from Sweden. From 1982 to 1988, he won seven Grand Slam singles titles (three at the French Open, three at the Australian Open, and one at the US Open), and one Grand Slam men's doubles title (at Wimbledon).
Document 3: Anna Kournikova: Anna Sergeyevna Kournikova (Russian: А́нна Серге́евна Ку́рникова ; ] ; born 7 June 1981) is a Russian former professional tennis player. Her appearance and celebrity status made her one of the best known tennis stars worldwide. At the peak of her fame, fans looking for images of Kournikova made her name one of the most common search strings on Google Search.
Document 4: Li Na: Li Na (; ; born 26 February 1982) is a retired Chinese professional tennis player, who achieved a career-high WTA-ranking of world No. 2 on 17 February 2014. Over the course of her career, Li won seven WTA singles titles and two Grand Slam singles titles at the 2011 French Open and 2014 Australian Open. Li's rise to prominence came after those victories, which made her the first and only Grand Slam singles champion from East Asia and Asia as a whole. Prior to this, she had already become the first player representing an East Asian and Asian country to appear in a Grand Slam singles final, a milestone she achieved at the 2011 Australian Open. Li was also the runner-up at the 2013 Australian Open and 2013 WTA Tour Championships, a three-time quarterfinalist at Wimbledon and a semifinalist at the 2008 Beijing Olympic Games and 2013 US Open. Among her other most notable accolades, she was the first Chinese player to win a WTA tour title at the Guangzhou International Women's Open in 2004, the first to reach a Grand Slam singles quarterfinal at the 2006 Wimbledon Championships, and the first to break into the world's top 10. Her feats have sparked a major population growth of tennis players in East Asia, earning her the reputation as the region's tennis pioneer and trailblazer.
Document 5: 1978 U.S. Pro Tennis Championships: The 1978 U.S. Pro Tennis Championships was a men's tennis tournament played on outdoor green clay courts (Har-Tru) at the Longwood Cricket Club in Boston, USA. The event was part of the 1978 Grand Prix circuit. It was the 51st edition of the tournament and was held from August 21 through August 28, 1978. Despite pressure to switch to a hard court surface from the Association of Tennis Professionals (ATP) and some leading players, in line with the surface change made that year by the US Open which directly followed the Boston event, the tournament organization elected to remain a clay court tournament in 1978. Several top players including Björn Borg, Guillermo Vilas and Jimmy Connors elected not to play the tournament. Fourth-seeded and defending champion Manuel Orantes won the singles title and the accompanying $32,000 first-prize money. The final was delayed until Tuesday, August 29 due to rain.
Document 6: Manuel Orantes: Manuel Orantes Corral (] ; born 6 February 1949) is a former tennis player who was active in the 1970s and 1980s. He won the US Open men's singles in 1975, beating defending champion Jimmy Connors in the final. Orantes reached a career-high singles ranking of World No. 2.
Document 7: Angelique Kerber: Angelique Kerber (] ; born 18 January 1988) is a German professional tennis player and former world No. 1. Having made her professional debut in 2003, Kerber rose to prominence upon reaching the semifinals of the 2011 US Open as the no. 92 ranked player in the world. She ascended to the top of the rankings on 12 September 2016, thus becoming the twenty-second and oldest player to achieve the number one ranking for the first time and the first new number one player since Victoria Azarenka in 2012.
Document 8: 1981 US Open – Men's Singles: John McEnroe was the two time defending champion and retained his title again, defeating Björn Borg 4–6, 6–2, 6–4, 6–3 in the final to win the Men's Singles tennis title at the 1981 US Open in a repeat of the previous years final, and which turned out to be Borg's final grand slam match.
Document 9: Steffi Graf: 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.
Document 10: Anna-Lena Grönefeld: Anna-Lena Grönefeld (born 4 June 1985) is a German tennis player. She turned professional in April 2003.
Document 11: Tatiana Golovin: 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.
Document 12: Elena Likhovtseva: Elena Alexandrovna Likhovtseva (Russian: Елена Александровна Лиховцева ] ; born 8 September 1975) is a Russian former tennis player. She turned professional in January 1992 at the age of 16.
Document 13: 1987 US Open – Men's Singles: Ivan Lendl was the two time defending champion and retained his title again, defeating Mats Wilander 6–7, 6–0, 7–6, 6–4 in the final to win the Men's Singles tennis title at the 1987 US Open. It was also the 6th consecutive US Open final of Lendl's record 8 consecutive US Open finals.
Document 14: 1988 US Open – Men's Singles: Mats Wilander defeated three time defending champion Ivan Lendl, 6–4, 4–6, 6–3, 5–7, 6–4 in the final to win the Men's Singles title at the 1988 US Open. This was the longest US Open men's final in history, clocking in at four hours and fifty-four minutes; this record was matched in 2012 when Andy Murray defeated Novak Djokovic in that year's final.
Document 15: 1968 US Open (tennis): The 1968 US Open (formerly known as U.S. National Championships) was a tennis tournament that took place on the outdoor grass courts at the West Side Tennis Club, Forest Hills in New York, United States. The tournament ran from 29 August until 8 September. It was the 88th staging of the tournament and the fourth Grand Slam event of 1968. It was the first edition of the tournament in the Open Era of tennis and as such for the first time offered prize money, totaling $100,000. Arthur Ashe and Virginia Wade won the singles titles. Ashe was still registered as an amateur and therefore not entitled to the $14,000 first-prize money, which instead went to runner-up Tom Okker, while Wade earned $6,000. Frank Parker, at the age of 52, lost to eventual champion Arthur Ashe in the second round, and still holds the record for the oldest man to compete in a Grand Slam singles tournament.
ground_truth: yes