Marine Gauthier first took part in FIS races in December 2005 . After her first podium in February 2007, she made her first start in the European Cup that same month . In September 2007 Gauthier won two races of the South American Cup and in January 2008 the first two victories in FIS races followed. Since then she has regularly competed in the European Cup. A fifth place in the downhill from Caspoggio was Gauthier's best European Cup result in the 2007/08 season , while two eighth places were her best European Cup results the following winter . In the 2009/10 season she achieved her best ever European Cup result with fourth place in the downhill from St. Moritz . Gauthier was very successful at the Junior World Championships . In 2009 she won the gold medal in the downhill with a lead of 48 hundredths of a second over the Norwegian Lotte Smiseth Sejersted and in 2010 the gold medal in the Super-G with a lead of 8 hundredths of a second over her teammate Jéromine Géroudet . In addition, she became French junior downhill champion in 2010.
In the World Cup Gauthier starts since January 2009. First, she went in any of their World Cup races in the points, so in the top 30. At the World Cup finals in 2009 and 2010 - where she was allowed to compete as a Junior World Champion in each discipline and in which, in contrast to all In other World Cup races, only the best 15 runners receive World Cup points - they finished last as 24th or 19th respectively. Gauthier won her first World Cup points on January 22, 2011 when she finished 25th in the downhill run from Cortina d'Ampezzo . Her best result so far is an 18th place, which she achieved on December 7, 2013 in the Lake Louise Downhill .