It's My Turn (1980)
A successful but stressed mathematics professor goes to her father's wedding and falls in love with her father's bride's son, a prematurely retired pro baseball player. She must choose between him and her current boyfriend, between Chicago and New York, and between research and administration.
Directed by: Claudia Weill
Starring: Jill Clayburgh, Michael Douglas, Charles Grodin, Beverly Garland, Steven Hill, Teresa Baxter
Links: Columbia Pictures, IMDb, Movie posters, Movie stills