In 2007 he was chosen by the prestigious Eurobasket website as most improved player in Danish League, and in 2008 already he participated in the All Star league.

In September 2008 he played against he Montenegro National Team (with Omar Cook, Ivan Koljević, Nikola Pekovic, Vlado Šćepanović and Drobjnak), and Nielsen finished with 9 points and 3 rebounds in 25 minutes (with 3 of 5 in three points shots).

The point guard distinguished by his shot from three points as well as his quick defensive, allowing him to steal many balls and launch fastbreaks with ease.

Career
2005-2006: Horsholm Basket (Basketliga): 12 games: 1.2ppg, 1.3spg
2006-2007: Horsholm Basket (Basketliga, starting five): 22 games: 6.4ppg, 1.8rpg, 2.8apg, 2.6spg
2007-2008: Horsholm 79ers (Ligaen, starting five): 22 games: 7.8ppg, 2.3rpg, Assists-4(4.2apg), Steals-3(2.4spg), 2FGP: 45.3%, 3PT: 28.0%, FT: 58.0%
2008-2009: Horsholm 79ers (Basketligaen): 16 games: 8.9ppg, 2.0rpg, 4.2apg, 2.8spg, FGP: 44.0%, 3Pts: 40.0%, FT: 63.0%

Awards / Achievements
Eurobasket.com All-Danish Basketliga Most Improved Player of the Year -07
Eurobasket.com Danish Basketliga All-Domestic Players Team -07
Eurobasket.com Danish Basketliga All-Newcomers Team -07
Danish National Team -07-08
Danish League All-Star Game -08
Danish League Semifinals -08