In the following years Groen was able to establish himself permanently in the top 300 in the individual. In doubles he even made it into the top 100 in 1997 to his highest ranking 61. After winning further doubles titles in the Challengers in Munich and Singapore in 1993 and 1994 , he made his only one in 1997 with Goran Ivanišević as a partner in Dubai Winning titles on the ATP World Tour . After four more titles on the Challenger Tour, Groen announced in 2002 that he would like to retire from full-time professional tennis. In 1999 when he won the tournament in Segovia, Groen played alongside the young Roger Federer , who won his first ATP title with Groen. The final also took place on Federer's 18th birthday.
After his retirement, Groen only played sporadically in tournaments on the ITF Future Tour and the Challenger Tour. On the former he even won three doubles titles at the age of 45 and 46 respectively. In 2016 he even took part in the Delray Beach Open , a tournament on the ATP World Tour , in Delray Beach for the first time since 2002 . On the side of Adelchi Virgili he lost in the opening round with 8:10 in the match tie-break . Until 2016 he still took part in tournaments.
successes
Legend (number of victories)
Grand Slam
Tennis Masters Cup ATP World Tour Finals
ATP Masters Series ATP World Tour Masters 1000
ATP International Series Gold ATP World Tour 500 Series
ATP International Series ATP World Tour 250 Series (1)