It Happens Every Spring is a 1949 comedy film starring Ray Milland and directed by Lloyd Bacon. The story of a baseball pitcher is completely fictitious, and the main character King Kelly is not based on or related to the actual player.
Suddenly, he realizes the possibilities and takes a leave of absence to go to St. Louis to pitch in the big leagues, where he becomes a star and propels his team to the World Series.Although the home team is St. Louis, and both St. Louis major league teams the Cardinals and the Browns played at Sportsmans Park at the time, the exteriors for the movie were filmed in Los Angeles Wrigley Field, which was built to resemble Wrigley Field in Chicago. ........
Source: Wikipedia