Question: What sport are Mary-Ann Eisel and Christo van Rensburg known for playing?
Related documents: [0]  [DOC] Mary–Ann Eisel (born November 25, 1946) is an American former tennis player. She was the US Open mixed doubles champion in 1968. [END] 
[1]  [DOC] Christo van Rensburg (born 23 October 1962) is a former professional tennis player from South Africa. [END] 
Answer: 
tennis player
tennis player