Question: Which tennis player is still playing, Yan Zi or Richard Krajicek?

full_context: Document 1: 1995 ABN AMRO World Tennis Tournament: The 1995 ABN AMRO World Tennis Tournament was a men's tennis tournament played on indoor carpet courts. It was the 23rd edition of the event known that year as the ABN AMRO World Tennis Tournament, and was part of the ATP World Series of the 1995 ATP Tour. It took place at the Ahoy Rotterdam indoor sporting arena in Rotterdam, Netherlands, from 27 February through 6 March 1995. Fifthe-seeded Richard Krajicek won the singles title.
Document 2: Lorenzo Manta: Lorenzo Manta (born 27 September 1974 in Winterthur) is a former tennis player from Switzerland, who turned professional in 1992. The right-hander reached his highest ATP singles ranking of World No. 103 in June 2000. His best achievement in the grand slam tournaments was reaching the fourth round at Wimbledon in 1999. There, he had a big upset win over the 1996 Wimbledon champion, Richard Krajicek, in the third round in five sets. Manta was then defeated by Brazil's Gustavo Kuerten in the fourth round. He was 4-0 in Davis Cup doubles matches with Roger Federer.
Document 3: Zheng Jie: Zheng Jie (born 5 July 1983) is a Chinese professional tennis player. Her career-high singles ranking is World No. 15 which she achieved on 18 May 2009.
Document 4: Yan Zi (tennis): Yan Zi (; ; born November 12, 1984), is a retired Chinese-born Hong Kong female professional tennis player.
Document 5: 1997 ABN AMRO World Tennis Tournament: The 1997 ABN AMRO World Tennis Tournament was a men's tennis tournament played on indoor carpet courts at Ahoy Rotterdam in the Netherlands. It was part of the World Series of the 1997 ATP Tour. The tournament ran from 3 March through 9 March 1997. Richard Krajicek won the singles title.
Document 6: Tennis at the 2010 Asian Games – Women's doubles: At the 2010 Asian Games in the Women's doubles tennis event, Zheng Jie and Yan Zi were the defending champions, but only Yan chose to participate, she partnered up with Peng Shuai.
Document 7: Sania Mirza: Sania Mirza (] ; born 15 November 1986) is an Indian professional tennis player who was formerly ranked No. 1 in the women's doubles rankings. From 2003 until her retirement from singles in 2013, she was ranked by the Women's Tennis Association as India's No. 1 player, both in singles and doubles. Throughout her career, Mirza has established herself as the most successful female Indian tennis player ever and one of the highest-paid and high-profile athletes in the country.
Document 8: Tie Ya Na: Tie Ya Na or Tie Yana (; born 13 May 1979) is a table tennis player from Hong Kong, China who won two silver medals at the 2006 Asian Games in the singles and doubles competitions.
Document 9: Goran Ivanišević: Goran Ivanišević (; born 13 September 1971) is a retired Croatian professional tennis player and current tennis coach. He is the only person to win the men's singles title at Wimbledon as a wildcard. He achieved this in 2001, having previously been runner-up at the championships in 1992, 1994 and 1998. Before the 2001 tournament, he was ranked 125th and after his victory he was 16th. His career-high singles ranking was World No. 2 (behind Pete Sampras) in 1994. He coached Marin Čilić from September 2013 to July 2016, leading Čilić to his biggest achievement to date, the 2014 US Open title.
Document 10: Chan Yung-jan: Chan Yung-jan (, born August 17, 1989), also known as Latisha Chan, is a Taiwanese tennis player. She is now studying International Sports Management and Sports Drama Studies Ph.D. in National Sports University in Taiwan. She is known mainly for her success in doubles competitions, having won 26 WTA Tour titles, including the 2017 US Open. She also finished runner-up in three other Grand Slam finals: the 2007 and 2015 Australian Open, as well as the 2007 US Open. Highlights of her singles career include semifinals in the 2006 Japan Open and finals in the 2007 PTT Bangkok Open. She reached her career high singles ranking of No. 50 on June 11, 2007.
Document 11: Chunli Li: Chunli Li {'1': ", '2': ", '3': ", '4': "} (born 28 February 1962 in Guiping, Guigang, Guangxi) is a Chinese-born New Zealand female professional table tennis player. She won a gold, silver and two bronze medals at the 2002 Commonwealth Games to cap off her long career. Her illustrious career began as one of the top table tennis players in China, specialising as a doubles player. Chunli migrated to New Zealand in 1987 and has since represented New Zealand until she retired in 2004 to concentrate as the national coach. She competed at four Olympic Games and one Commonwealth Games for New Zealand. Since 2011, she came out of her "retirement" and started representing New Zealand again. Chunli led the New Zealand team at the 2014 Commonwealth Games in Glasgow, Scotland, United Kingdom.
Document 12: 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 13: Pete Sampras career statistics: This is a list of the main career statistics of American former tennis player Pete Sampras. He turned professional in 1988 and his official retirement occurred in August 2003. During his career Sampras won 64 singles titles, including 14 titles at Grand Slam events. He competed in 16 ties for the United States Davis Cup team between 1991 and 2002 and was a member of the cup winning team in 1992 and 1995. Sampras reached the No. 1 ranking on April 12, 1993 and in total held that position for 286 weeks.
Document 14: 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 15: Richard Krajicek: Richard Peter Stanislav Krajicek (, born 6 December 1971) is a Dutch former professional tennis player. In 1996 he won the men's singles title at Wimbledon, the only Dutch player to have done so. In the quarterfinals of that tournament, he defeated Pete Sampras in straight sets. This was Sampras' only singles defeat at Wimbledon between 1993 and 2000. Since 2004, Krajicek has been the tournament director of the ABN AMRO World Tennis Tournament in Rotterdam. He is also the author of various sports books. Krajicek reached a career-high singles ranking of world no. 4 in March 1999.
ground_truth: Richard Peter Stanislav Krajicek