Schwarz/Oppelt stepped onto the European podium for the first time at the 1953 European Championships, where they won the bronze medal, and then placed sixth at the World Championships. In 1954, they became European silver medalists and went on to win their first World medal, bronze, at the 1954 World Championships. They followed it up with silver at the 1955 World Championships, finishing as close runners-up to Canada's Frances Dafoe / Norris Bowden, who took their second World title.