De Jager won the 1991 US Open junior competition alongside Karim Alami and became a professional tennis player the following year. He played a few games on the ATP Challenger Tour and was able to qualify for Wimbledon , where he was defeated by Richard Krajicek in the first round match . As a result, he concentrated completely on doubles and was able to win his first two challenger tournaments with Byron Talbot in Madeira and with Christo van Rensburg in Jerusalem in the same year. In 1992 he won his first doubles tournament on the ATP World Tour with the Kremlin Cup . He was able to win a total of seven tournaments with changing partners. Another twelve times he was in a final, including in 1999 at the Weissenhof tournament in Stuttgart . Among other things, he reached the final of the Gerry Weber Open in 1998 on the side of Marc-Kevin Goellner . He reached his highest ranking in the tennis world rankings in 1992 with position 313 in singles and in 2000 with position 11 in doubles.
His best individual result in a Grand Slam tournament was qualifying for the first round of Wimbledon. In the doubles competition he reached the semi-finals of the Australian Open , Wimbledon and the US Open . He each had a different partner, these were the South Africans Marcos Ondruska (Australian Open 1993), Robbie Koenig (US Open 1998), and David Adams (Wimbledon 2000). He was also twice in the mixed final , in 1995 at the side of Jill Hetherington at the French Open and 1997 with Larisa Neiland at the Australian Open.
South Africa
Moscow
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Marius Barnard
Tel Aviv
Jan Apell Jonas Björkman
Toulouse
Dave Randall Greg Van Emburgh
Rotterdam (1)
Neil Broad Peter Tramacchi
Munich
Max Mirny Nenad Zimonjić