The woman who was allegedly punched by star boxer Sergey Kovalev in a 2018 attack says she needed a plate and 4 screws in her neck to fix the damage he caused ... and she says she's still in pain.
Jamie Frontz claims she was socked in the face by the 36-year-old Russian after she denied his sexual advances after the two met at the opening of a boxing gym in Big Bear, Calif. in June '18.
In a conversation with TMZ Sports ... she described how the alleged assault went down -- and it's graphic.