Grönhagen played 121 tournaments on the Challenge Tour 1992–2001, including one win.

[1] In 1994, he narrowly missed out on two victories, losing the Swedish Matchplay Championship final to Per Nyman 1 up,[2] and losing a playoff at the Volvo Finnish Open to Mikael Piltz.

[3] Grönhagen played on the 1995 European Tour with best finish T25 at Volvo Scandinavian Masters, ending up 138th in the season rankings.

[4] After retiring from tour, Grönhagen became a golf instructor,[5] coaching Simon Forsström and HRH Prince Daniel, Duke of Västergötland.

[6] Challenge Tour playoff record (0–1) Source:[7]