[5][6] At the 1999 DSV Hook Masters at Hook Golf Club, Malmgren shot a round of 62 (–11), the lowest-to-par round recorded in tournament play in Sweden at the time, only matched by Craig Stadler, Fredrik Orest and Fred Couples.

[7] In 2004, he won the Hansabanka Baltic Open in Latvia and topped the Nordic Golf League ranking ahead of Magnus A.

[9][10] His best result on the Challenge Tour was runner-up in the 2001 Nykredit Danish Open, two strokes behind Sébastien Delagrange of France.

[11] Malmgren was the victim of an unprovoked assault in Malmö in 2006 and spent nine days in intensive care.

This effectively ended his European career, although he managed to recover and won the 2012 Danish PGA Championship.