Sidney Hatch was also a well-known marathon runner in his time. From 1904 through 1922 he ran more than 45 marathons with a score of victories including the Chicago Marathon in 1909 and the Yonkers Marathon in 1911, competing as a member of the Illinois State Gaelic A.A In 1910, he finished in 5th place in the Yonkers Marathon, competing as a member of the ChicagoIrish American Athletic Club. He never failed to finish a marathon. He was a six-time winner of the Missouri Athletic Club's All Western Marathon in St Louis including the 1908 marathon that qualified him for the 1908 Olympics. He competed in the marathon in two Olympics, placing 8th in 1904 at St Louis and 14th in 1908 in London. He won a silver medal in the 1904 OlympicsFour Mile team event. On January 8, 1909, Hatch finished third behind Matthew Maloney and James Crowley in an indoor marathon before 5,000 "wildly cheering" spectators held within the second Madison Square Garden. Maloney was reported to have set a new indoor record for the event. On November 27, 1909, Hatch finished sixth in the third edition of the Yonkers Marathon. In March, 1912, Hatch was one of "twenty of the best distance runners in the middle west" scheduled to participate in a 20-mile indoor marathon at Riverview Rink in Chicago, Illinois. He also qualified for the 1912 Olympics but did not compete. He placed in the top 10 in the Boston Marathon several times with third-place finishes in 1915 and 1916. He finished second in the Boston Marathon in 1917. In October 1916 he set a record in the 96 mile, Milwaukee to Chicago Run, completing the race in 14 hours, 50 minutes and 30 seconds. He served as a US Army messenger in World War I and was decorated for "extraordinary heroism" under fire at near Brieulles, France, 11 October 1918. He was awarded the Purple Heart and Distinguished Service Cross as well as the French Croix de Guerre. After World War I he returned to run two more Boston marathons before retiring from marathon running. He was a letter carrier in River Forest, Illinois from 1923 to 1953, retiring at age 70. He and Gertrude Morris were married in 1921 and had three children; Herbert, and twin girls June and Jane. He was born in River Forest, Illinois and died in Maywood, Illinois. Sidney is buried at the Chapel Hills Gardens West Cemetery, Oak Brook Terrace, Illinois.