A woman was sexually assaulted at an Upper West Side subway station early Sunday, cops said.

The 32-year-old victim was entering the No. 1 train station on West 86 Street and Broadway in Manhattan around 12:30 a.m. when an unidentified man pushed her against the wall of the stairwell and fondled her genitals under her clothes, according to police.

The victim attempted to fight her attacker by pushing him away, police said.

The suspect eventually fled the scene.

The investigation is still ongoing.