Hantschk played from 1995 on satellite tournaments, where he won his first world ranking points. In 1997 he played in six of the nine ATP Challenger tournaments held in Germany , his best result was reaching the quarter-finals in Weiden , Eisenach and Neumünster , in the latter he was also in the double-finals with Lars Burgsmüller . In 1999 he won his first Challenger title in Magdeburg . The following year he was twice in the finals of an ATP tournament , but lost in both. His highest single listing on the tennis world rankings was 71st in 2000.
Hantschk was German champion in men's singles twice, in 1998 and 2002.