After playing several seasons in Sweden with Västra Frölunda IF, he signed as a free agent in 1980 with the St. Louis Blues. Known as "The Handsome Swede" by Blues supporters, Petterson made an impact as an excellent first-line forward alongside Bernie Federko and Brian Sutter, setting the team record for points as a rookie with 73.
After playing several seasons in Sweden with Västra Frölunda IF, he signed as a free agent with the St. Louis Blues in 1980, becoming known as "The Handsome Swede" by fans. He made an impact as a top-line forward alongside Bernie Federko and Brian Sutter, setting the team record for points as a rookie with 73.