Oscar Mathisen was National Champion in 1907 at the age of 18, and became World Champion the following year (four years after his brother Sigurd Mathisen), despite falling on the 500 m. During his career, he set 14 world records, with his 1,500 m record from 1914 standing unrivalled for 23 years. The day before he set that 1,500 m record, he had broken Jaap Eden's world record on the 5,000 m and thereby had become the world record holder on all distances. He became World Allround Champion five times, a record that stood until 2013 when it was broken by Sven Kramer, and European Allround Champion three times.