Which tennis player is still playing, Yan Zi or Richard Krajicek?
Richard Peter Stanislav Krajicek
Yan Zi (tennis)
Yan Zi (; ; born November 12, 1984), is a retired Chinese-born Hong Kong female professional tennis player.
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.
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. Yuan Meng
Yuan Meng (born 9 May 1986) () is a former Chinese female professional tennis player.
 She is China's fifth-highest ranked women's singles player after Zheng Jie, Li Na, Peng Shuai, and Yan Zi.
 Yuan has won four ITF singles titles and one ITF doubles title. 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. 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. Marc-Kevin Goellner
Marc-Kevin Peter Goellner (born 22 September 1970) is a former professional tennis player from Germany.
 He won two singles titles, achieved a Bronze medal in doubles at the 1996 Summer Olympics and attained a career-high singles ranking of World No. 26 in April 1994.
 Goellner reached the quarterfinals of the 1997 Rome Masters, defeating top tenners Richard Krajicek and Albert Costa en route. Austin Krajicek
Austin Krajicek (born June 16, 1990) is an American professional tennis player.
 He is a distant cousin of Dutch tennis player Richard Krajicek, whose half-sister Michaëlla Krajicek is also a tennis player. 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. Mervana Jugić-Salkić
Mervana Jugić-Salkić (born 14 May 1980) is a Bosnian former tennis player.
 She turned professional in 1999, and reached her highest singles ranking on 21 June 2004, when she was ranked World No. 99.
 On 10 July 2006, Jugić-Salkić reached No. 59 in doubles, after winning ASB Classic in 2004 with Jelena Kostanić and Internazionali di Modena in 2005 with Yuliya Beygelzimer.
 She also won 15 singles and 43 doubles events organized by International Tennis Federation.
 Jugić-Salkić represented Bosnia and Herzegovina at the 2004 Summer Olympics, but fell to Maria Elena Camerin in the first round.
 During her long career, she defeated players such as Yan Zi, Victoria Azarenka, Bethanie Mattek, Sania Mirza, Anabel Medina Garrigues, Nuria Llagostera Vives and Sybille Bammer.