Question: Which tennis player is still playing, Yan Zi or Richard Krajicek?
Related documents: [0]  [DOC] Yan Zi (; ; born November 12, 1984), is a retired Chinese-born Hong Kong female professional tennis player. [END] 
[1]  [DOC] 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. [END] 
Answer: 
Richard Peter Stanislav Krajicek
Richard Peter Stanislav Krajicek