Tim Dieck

Dieck started skating in 2000 and took up ice dancing in 2011.[3] He skated with Dana Wehner in the 2011–12 season. They placed 9th at the 2012 German Junior Championships.[5]

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.[6] Clarke decided to retire at the end of the season.[7][8]

Vitali Schulz arranged a tryout between Dieck and Katharina Müller.[8] They teamed up in April 2014, coached by Schulz und James Young in Dortmund.[3] Assigned to two 2014–15 ISU Junior Grand Prix events, they placed 8th in Ljubljana, Slovenia, and 7th in Aichi, Japan. After winning the 2015 German junior national title, they were sent to the 2015 World Junior Championships in Tallinn, Estonia; ranked 13th in the short dance, they qualified for the final segment and finished 12th overall.

Competing in the Challenger Series (CS), Müller/Dieck finished tenth in September at the 2015 Nebelhorn Trophy – their first senior international – and eighth the following month at the 2015 Mordovian Ornament. In November, they won bronze at the 2015 NRW Trophy before appearing at their third CS event, the 2015 Tallinn Trophy, where they placed fifth. They were awarded the silver medal at the German Championships in December, having finished second to Kavita Lorenz / Panagiotis Polizoakis, and took bronze at the Toruń Cup. Müller/Dieck were included in Germany's team to the 2016 European Championships in Bratislava, Slovakia, but were eliminated after placing 23rd in the short dance.[9]

In spring 2016, Müller/Dieck began training under Marina Zueva in Canton, Michigan, in addition to Schulz and Young in Dortmund.[3]