In the 2007 season, Fill was among the overall leaders for the overall World Cup title, the first Italian since Alberto Tomba to rank in the overall top ten.

In 1999, he won every discipline at the National Junior Championships and returned home with four gold medals; he was called "the phenomenon" by the Italian press.

On March 21, 2007, he became Italian Champion in multiple disciplines (twice in super-G and once in giant slalom), bringing his career total of national championships to 3.

On 4 February 2009, he won the silver medal in super-G during the World Championships in Val-d'Isère (France) on the icy and steep slope Face del Bellevarde.

He managed to place himself before the three-time World Champion Aksel Lund Svindal, but was not fast enough to beat the Swiss Didier Cuche.

[4] Fill won his second World Cup race in 2016, the downhill at Kitzbühel, on a difficult dark and windy day on the Streif that ended the season of overall leader Aksel Lund Svindal.

His idol in everyday life is his uncle Norbert Rier, leader of the Kastelruther Spatzen (a well-known folk group, especially in German-speaking countries) who dedicated the song "Wiedermal a super Zeit" to Fill for his silver medal in super-G at the World Championships in Val-d'Isère in 2009.