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Johnathon Holmes, 35, had followed the young female victim for over a mile before dragging her into the bush to rape her.
As he climbed on top of her and pushed his tongue into the woman's mouth he said: "You're going to enjoy this"
But the young woman had realised she was being followed in Sheffield city centre and courageously fought off Holmes.
She punched him several times in the stomach, bit his tongue and used her keys as a weapon to stab him in the neck.
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Holmes fled the scene but police were able to track him down in just a few hours, the court heard.
But when Holmes was arrested he claimed he had no recollection of the evening because he was drunk.
But as his mugshot revealed, he had been battered by his victim so fiercely he was left looking like Frankenstein's monster.
And detectives later traced him on CCTV, hiding behind walls and watching lone women during the afternoon.
Holmes admitted a charge of sexual assault and was jailed for four and a half years.
Sentencing him Judge Sarah Wright said she had "no doubt whatsoever" he had deliberately targeted the young woman and added his victim had "fought back with considerable bravery and courage".