Slowly, Koen rose to the top. In 1938, she ran her first world record (11.0 seconds in the 100 yards), and she also won her first international medals. At the European Championships in Vienna, she won the bronze in both the 100 and 200 m, which were both won by Stanisława Walasiewicz. Many observers, and Koen herself, expected her to do well at the upcoming Olympics, which were due to be held in Helsinki in July 1940.