Árpád Lengyel was a swimmer and water polo of BEAC. In 1939, he played four times in the Hungarian water polo team but achieved outstanding results in swimming. During his career, he won a total of 11 individual and 7 relay national championships, as well as setting 20 national records. Between 1933 and 1939, he appeared 15 times for the Hungarian swimming team. As a member of the Hungarian 4 × 200 metres relay team, he set European records in 1935 and 1936, and won the European championship title in 1934, followed by the Olympic bronze medal in 1936. In 1937, with the BEAC team, he achieved a world record in the 4×100 metres freestyle relay. At the European Championships in London (1938), he proved his international class by winning the bronze medal in the 100 metres backstroke. He ended his active sports career in 1940.
In 1938, he obtained a law degree at the Pázmány Péter University. In 1940, he got a job as a lawyer in the V. district mayor’s office, and then became an official of Gamma Rt. In 1943 and 1944, he trained the swimmers of Gamma SK and played on the club’s water polo team. After the war he was dismissed and worked as a physical worker until the revolution. In 1956, he settled in the United States and found a job in the profession that he studied.