After having curled with the Mike Armstrong junior rink, Flasch joined the Braeden Moskowy rink at second position in 2010. The team won the Saskatchewan Junior championships that year, earning the rink the right to represent Saskatchewan at the 2011 Canadian Junior Curling Championships. At the Canadian Juniors, the team- which also included Kirk Muyres and Matt Lang- went undefeated (12-0) through the round robin, and proceeded to win the event by defeating Ontario's Mathew Camm in the final. The team would go on to represent Canada at the 2011 World Junior Curling Championships where they would find less success. The team found themselves in 4th place after the round robin with a 6–3 record. The team beat Norway (Steffen Mellemseter) in their first playoff match, but in the semi-final they lost to Switzerland (Peter de Cruz), and then lost to Norway again in the bronze medal game. After the World Juniors, the team played in their first Grand Slam event, the 2011 Players' Championship where they surprised many by making into the quarterfinals. After the season, Moskowy and Muyres graduated from the junior level. Lang and Flasch remained together, with Lang at skip and Flasch at second. They added Tyler Hartung and Jayden Shwaga.