Mannewitz made his international debut in the Rollerski World Cup for seniors in La Bresse, France , on August 30, 2013 and was tenth in the sprint freestyle. One day later in the 13.6 km freestyle mass start 14th in the overall standings, he was 53rd. On May 26, 2013, he entered his first race in the Roller Ski Saxony Cup in Markkleeberg and was fourth in the men's class. At the season finale in the Rollski-Sachsen-Cup he finished second in Schkeuditz . At his first German roller ski championships he took sixth place in the men's class in Klotzsche on the 6 km flat course. In the 2014 season he took part in two World Cup stations. His best result was tenth twice. At the end of the season he was 31st overall. At the German Roller Ski Championships in Seiffen , he was fourth in the 10 km mountain run and sixth in the men's class on the 6 km flat course in Stadthagen . At the first Saxony Championships in Trebsen in 2014 , he won the silver medal in the men's class. In 2014 he won the Hohburg roller skiing in the men's class in the Rollski Cup Sachsen .
Germany