Sinner became a professional tennis player in 1988 and won the Challenger tournaments in Fürth and Neu-Ulm that same year alongside Michael Stich . The following year, the two celebrated victories at the Intersport Heilbronn Open and in Salzburg . In 1990 Sinner won his first individual title on the Challenger Tour with a final victory over Wayne Ferreira in Pretoria . In the following years he mainly played Challenger tournaments, in which he won further single and double titles. In the early 1990s, however, he was thrown back from a protracted ligament injury. 1995 turned out to be his most successful year. He won two tournaments on the ATP World Tour ; in the final in Copenhagen he needed three sets against Andrei Olchowski , at the South African Open he defeated Guillaume Raoux in two sets; in addition, he stood there at the side of Joost Winnink in the double final. In the same year he reached his best ranking in the ATP world rankings with position 42 . His best individual result in a Grand Slam tournament was reaching the second round of the Australian Open in 1996.
Between 1985 and 1998 he played in the German Bundesliga . In the 1990s he was part of the ETuF Essen team , with whom he became German team champion in 1997 with Carl-Uwe Steeb and Eric Jelen, among others . In addition, he was in the squad of the German Davis Cup team in 1996 and 1998 , but was not used.
In 2010 he coached the Juniors in Canada. Sinner has been a trainer for the Swiss Tennis Association since 2011. Martin Sinner has been A-Trainer at TC Leonberg since 2014.
Germany
Copenhagen
Andrei Olchowski
Johannesburg
Guillaume Raoux
