At first a basketball player in Brno, Fleischlinger later became a coach and led the Sokol Brno I. team to five title victories in the Czechoslovak Basketball League between 1945 and 1951. He was an assistant coach of the Czechoslovak basketball team at the 1946 European Championship in Geneva, where the team won a gold medal. As a coach, he twice led the national team at the Olympics (1948 in London — 7th place; 1952 in Helsinki — 10th place) and twice earned a silver medal at EuroBasket (1947 in Prague, 1955 in Budapest). From 1946, he was a FIBA referee, later a commissioner at FIBA tournaments. He relinquished his coaching career in 1955 in order to devote himself to his duties as the FIBA official. In the Czechoslovak Basketball Federation, Fleischlinger headed the referee section and was a member of the Federation's committee.