Question: In which sport did the Czech stars Daniel Vacek and Hana Mandlíková gain professional status?
Sentence (from "Hana Mandlíková"): She was also the runner-up at four Grand Slam singles events, including the Wimbledon finals of 1981 and 1986, and won one Grand Slam women's doubles title, the 1989 US Open with Martina Navratilova.
Relevant evidence: No