Take Me Out to the Ball Game (1949)

The champion baseball team has a new, strict owner who has the audacity to be (gasp) female. Sinatra and Kelly as the star players are aw-shucks charm & icky smarm, respectively. It's fun enough, but the quartet of Kelly, Sinatra, Jules Munshin, and Betty Garrett did the musical romcom better later this same year with On the Town.

B-