Question: What is the surname of the person the Czech winner of 12 Grand Slam doubles titles and four Grand Slam mixed doubles titles defeat in the 1998 wimbledon women's singles semifinals?
Sentence (from "Williams sisters"): Between 2000 and 2016, a 17-year span, they collectively won 12 Wimbledon singles titles (Venus won 5 and Serena won 7).
Relevant evidence: No