Born on October 12th, 1964. in Prague, Czech Republic. Residence: Monte Carlo. Professional since 1993. 188 centimeter tall (6'2"). Right-handed. One of the small number of tennis players who is equally sucessful in single and in double. He achieved his highest career ranking on April 17th, 1989. - seventh. Ranked fourth in doubles on October 13th of the same year. With Guy Forget World Doubles Champion in 1990. Last season finished in 35th place.

Won five tournaments: London, Johannesburg (1988), Rotterdam (1989), London (1990), Basel (1991). Nine time finalist: Rotterdam (1985), Hilversum (1986), Gstaad, Bordeaux (1995).

In late 80s, Jacob Hlasek was one of the leading World tennis players. Especially indoors. His best season was in 1988. when after victories in London and Johannesburg, finals of Bruxelles, he qualifed for the final tournament, Masters which was back then played in Madison Square Garden (New York). After victories over Ivan Lendl, Tim Mayotte, Andre Agassi he was defeated in semi-finals by Boris Becker 7:6, 7:6. With Marc Rosset he let Switzerland to the Davis Cup finals (1992). Excellent doubles player. Won 20 tournaments. Ten times finalist. Beside ATP World Championship (Forget), he was winner of Roland Garros in 1992. (Rosset), two times Wimbeldon semi-finalist with Sloil (1986), and Forget (1992) who is his best friend at the Tour. After a series of disappointing results in the beginning of the season, decided to leave tennis, but after the final in Gstaad (Kafeljnikov), and final in Bordeuaux (Doumbia) where he defeated Goran Ivanisevic he returned where he wanted, 35th on the ATP list.

Jacob Hlasek is one of five tennis players who played all three Olympics, Los Angeles, Seoul and Barcelona. He was born in Czech Republic. When he was four he came to his second homeland, Switzerland. Father was a famous hockey player so Jacob's first sport was on ice but father convinced him to move onto a more "safer" sport. He is still one of the best hockey players among the tennis players although some might not agree on it.