In October 2003, Pachlová/Knoth won bronze at a JGP event in Ostrava, Czech Republic. In January, they outscored Diana Janošťáková / Jiří Procházka to win the Czech national senior title and were selected to compete at the 2004 European Championships. Making their senior international debut, they finished 19th at the European Championships, which took place the following month in Budapest, Hungary. In March, they achieved their career-best ISU Championship result, tenth, at the 2004 World Junior Championships in The Hague, Netherlands. They were coached by Natalia Vorobieva until the end of the season.