My latest choices are for 1926:
Gertrude “Trudy” Ederle (USA – Swimming) – the first woman to swim the English Channel which she did in 1926 in a time two hours faster than any previous crossing. In 1919 she set a world record for the 880 yards freestyle aged 12 years 298 days (the youngest record holder in swimming history). She set eight other world records in her career, seven of those being in 1922. Her one Olympic appearance in 1924 was disappointing with two individual bronzes although she won a gold medal in the freestyle relay.
Frank Gotch (USA – Wrestling) – the first American world heavyweight professional wrestling champion who is credited with popularising the sport in the USA. He held the world title from 1908 (winning the title in a fight lasting over two hours) to 1913, one of the longest reigns in history. He retired as undefeated champion and didn’t lose a fight after 1908 in a career with a total of more than 400 wins.
Thorleif Haug (Norway – Nordic Skiing) – winner of three gold medals at the first Winter Olympics in Chamonix. Two were in cross-country skiing races and the third was at Nordic Combined. He won the 50km race at the Holmenkollen festival a record six times between 1918 and 1924 and the Nordic combined event three times.
Christy Mathewson (USA – Baseball) – one of the best right-handed pitchers in history. Won more than 20 games in a season 13 times included every season from 1903 to 1914. One of the inaugural inductees into baseball’s Hall of Fame, he won 373 games in his career (a National League record). He is the only pitcher in major league history ranked in the Top Ten all-time for career wins and ERA.