After becoming the amateur road champion in 1924 and French champion in both 1924 and 1925, he became a professional with the Thomann-Dunlop team in 1926 . From 1927 to 1933 he drove for the Alcyon-Dunlop team . In 1934 he founded his own team A. Leducq-Mercier , for which he started until 1939.
In 1924 Leducq also started at the Olympic Games in Paris . In the road race he was ninth, while Armand Blanchonnet took gold, René Hamel bronze and Georges Wambst took eighth place; thus the French team won gold in the team classification. Even if you actually had to be an amateur to take part in the Olympic Games at the time, the French federation had institutionalized an elegant way of circumventing the rules: Leducq received 1,000 francs per month, another 2,000 francs for the victory, but had to make fancy calculations which the association then reimbursed. His greatest successes were during his time at Alcyon-Dunlop . At the Tour de France 1930 he took over the yellow jersey after the ninth stage from Learco Guerra , who was 14:13 minutes behind and was second overall behind Leducq. In his second victory in 1932 , he took over the yellow jersey after the third stage and had a 24:03-minute lead over Kurt Stöpel, who came in second .
1931 Leducq / Pelissier: 6th place (2 laps behind)
1932 Leducq / Pelissier: 4th place (1 lap behind)
1933 Leducq / Wambst: 6th place (1 lap behind)
1934 Leducq / Pelissier: 7th place (2 laps behind)
1935 Leducq / Magné: 8th place (1 lap behind)
1935 Leducq / Speicher: 7th place (8 laps behind)
1936 Leducq / Dagen: 5th place (2 laps behind)
Remarks
↑ The times of the three best French drivers were added together for the team classification. Leducq had the worst time, but is still listed as a gold medal winner in the Olympic database.
↑ Arnd Krüger : Whose Amateurism? The international standardization of the 'ama-teur' in the later 19th and early 20th centuries, in: Angela Teja; Arnd Krüger & James Riordan (Eds.): Sport e Culture - Sport and Cultures. Atti del IX Congreso internazionale dell 'European Committee for Sport History (CESH). Crotone, Italia 26.-29. September 2004. Calopezzati (CVS): Ed. di Convento ( ISBN 88-7862-003-3 ), 2005, 294 - 307.
^ Jean Durry: Un popular champion: André Leducq, vinqueur de Tour de France cycliste. Sport / Histoire 1: 1, 123-136 (1988)