A New Jersey woman’s days as an executive assistant at Manhattan-based baseball-card company Topps were spent doing errands for her boss’ mistress, and then running interference when he broke up with the woman, she claims.

Nyeema Jackson says in Manhattan federal court papers that her boss, Warren Friss, asked her to do whatever his alleged lover, Patricia Oddshammar, wanted.

Friss canned her just two weeks after she returned from sick leave, she claims.

“The case is completely meritless,” a Topps spokesman said.