Fill is an all-round skier. 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. Fill learned to ski at the age of 3 with the help of his first teacher Frieda Senoner. He achieved his first successes during his middle-school years, while he was coached by Peter Thomaseth. In 1997/98 he joined the Seiser Alm training center, where he was coached by his uncle Arnold. In the same year he joined the B-Pool of the Bolzano-Bozen ski team. One year later he advanced to the A-Pool under Stephan Feichter. 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. In 2000, Fill joined the national teamfor the first time. His coach was Ernst Pfeifhofer, who continued as his coach for the following year in the Italian B-Team. At the same time he became a member of the Carabinieri sportsgroup. As a junior in 2001, he achieved his first important success on an international level, a bronze medal in the super-G at the Junior World Championships. In 2002/03 he was part of the A-Team of Flavio Roda for the first time. In February 2002, Fill won the World Juniors and, as a result, took part in his first super-G race of World Cup on 7 March 2002 at Altenmarkt in Austria, where he placed 12th outpacing the Norwegian Lasse Kjus by one hundredth of a second. While Fill's strengths are the downhill and super-G, he is also competitive in the technical disciplines. On 13 January 2006 he stood 3rd on the Ski World Cup podium of the super combined race in Wengen. During the 2006 and 2007 World Cup seasons, Fill had seven podiums: four in downhill, two in super-G, and a combined, but no wins. On March 21, 2007, he became Italian Champion in multiple disciplines, bringing his career total of national championships to 3. During the 2008 season, he was unable to reach the podium but managed to place in the top ten 10 on six occasions. On 29 November 2008 in Lake Louise he won his first World Cup competition, beating Swiss Carlo Janka and Swede Hans Olsson, becoming the seventh Italian in World Cup history to win a downhill competition. On 4 February 2009, he won the silver medal in super-G during the World Championships in Val-d'Isère on the icy and steep slope Face del Bellevarde. He managed to place himself before the three-time World ChampionAksel Lund Svindal, but was not fast enough to beat the Swiss Didier Cuche. His medal was the only one won by the Azzurri in the men's competitions. 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. Fill went on to become the first Italian to win the World Cup downhill title, finishing 10th at the last downhill of the season in St. Moritz in March 2016 to finish 26 points ahead of Svindal.
Personal
Fill is a cousin of retired giant slalom racer and fellow Kastelruther Denise Karbon. After junior high school, he started working as an auto body mechanic while attending a vocational school, which he left after becoming more involved in alpine skiing competitions. His mother tongue is German but he is also fluent in Italian and English. His idol in everyday life is his uncle Norbert Rier, leader of the Kastelruther Spatzen 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. Since 2007, Fill's manager has been Andreas Goller, who previously represented Kristian Ghedina. His ski technician is South-Tyrolean Sepp Kuppelwieser. During the 2009 season, Atomic, Briko, Finstral, and Leki, as official sponsors and suppliers, decided to reward Fill for his excellent results achieved during the season, offering him the chance to win the Artega GTsport car if he were to capture the downhill at the World Cup finals in Sweden at Åre in March.