It's My Turn 1980

Synopsis:

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
Written by: Eleanor Bergstein
Release date: 1980-10-24
Runtime: 91 minutes
Tagline: Just when she thought she had everything right... in stepped Mr. Wrong.
Cast:
Jill Clayburgh
Jill Clayburgh
Dr. Katherine "Kate" Gunzinger 
Michael Douglas
Michael Douglas
Ben Lewin 
Charles Grodin
Charles Grodin
Homer 
Steven Hill
Steven Hill
Jacob Gunzinger 
Teresa Baxter
Teresa Baxter
Maryanne