In 2012–13, Dieck began competing with Florence Clarke. They were 5th at the 2013 German Junior Championships. The following season, they debuted on the ISU Junior Grand Prix series, finishing 9th in Riga, Latvia and 15th in Gdańsk, Poland. They were also assigned to the 2014 World Junior Championships in Sofia, Bulgaria, but were eliminated after placing 27th in the short dance. Clarke decided to retire at the end of the season.