Gustaf Mattsson was a top distance runner, successful at distances from the steeplechase up to the marathon. He was selected for the 1920 Olympic steeplechase, which was a surprise as there were no trials in the event, and placed fourth. He had first run the steeple at the 1914 Baltic Games, placing sixth, and he was third that year in the Swedish Championships. He had few opportunities to run the steeplechase in that era, but did finish fourth in the event at the 1923 International Göteborg Games. Mattsson was better at longer distances, winning the Swedish title three times at 20 km on the road, and placed second once in the Swedish marathon championship. He made his living as a businessman.
Personal Best: 3000S – 10:05.4 (1923).