The former star of the TV show "Lost" slapped Heather Bormann with a countersuit earlier this month after she sued him in Cleveland for at least $75,000 in damages. Fox also demanded a jury trial.
Bormann's attorney filed a motion Monday seeking to have Fox's lawsuit dismissed, calling it frivolous.
In her lawsuit, Bormann alleged that Fox struck her in the breast, groin, arm and legs after she stopped him from boarding her chartered party bus on Aug. 28. Fox was in Cleveland making a movie.
Prosecutors declined to file charges in the case.
Fox's attorney said Tuesday he hadn't seen the motion and couldn't comment.