Dame Joan Hammond was a leading female amateur golfer before taking to opera full-time.
Bing Crosby's son, Nathaniel Crosby, turned pro in the early 1980s and played on the European tour. He featured on a number of his father's records.
Anthony Armstrong Jones (not the ex royal husband) was a former professional golfer who became a low-level country star in the late 60s/early 70s.
And Althea Gibson, the first black person to win a tennis grand slam (1955 French Open), later turned to careers in both professional golf and music after racism curtailed her time on the court. Because if you want to avoid racism, you go to a golf course.