The Wigan Athletic striker, a married father-of-three, groped the attractive 20-year-old and made repeated advances on her at a celebrity nightclub, jurors were told.
She asked him to stop pestering her, and told King to “take your multi-millions and leave”.
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But he replied “you’re not even in my league” and then allegedly “smashed her in the face with a clenched fist”.
Prosecutors told Southwark Crown Court the act of "completely gratuitous violence" came just minutes after King approached the slightly-built female victim, who cannot be named for legal reasons, at the Soho Revue Bar last December.
She was part of a group of "sporty type" friends who were complete strangers to the Jamaican international footballer, it is claimed.
Roger Daniells-Smith, prosecuting, said King touched the 20-year-old on the bottom in a “deliberate and sexual” way.
The victim told the court she was “quite disgusted and shocked” and said she turned to see the man “smirking at me in a suggestive way”.
She said "firmly" to him: "Don't touch me."
But instead of "taking the hint", King allegedly turned to two other women in the group of 20 people and started stroking their necks.
"They, too, recoiled from his touching them and told him very clearly to stop behaving in this manner," Mr Daniells-Smith said.
He continued to harass the groupm it is claimed, and when the first woman told him to stop again he replied: “Don't you know who I am, I'm a millionaire”.
The woman told the court: "Then he started poking me in the head, pushing my temple like he was enjoying it, repeating 'not even in my league'.
"I kept on repeating 'take your multi-millions and leave - no one cares, just get away from the table. I felt tiny, I felt really embarrassed.”
She said that when she tried to “shoo” him away, he grabbed her wrist and pulled it down, then when a friend intervened, let her go.
“When I looked up he punched me in the face,” the woman said. "It was hard enough to knock me off my feet.”
The student, who said she was “quite a lot smaller” than King, wept as she listed the injuries allegedly inflicted on her by the £5million striker.
"It split my lip, broke my nose and gave me a black eye. It felt like I was bleeding everywhere but it was mainly my nose and mouth."
King, 29, denies sexual assault "by touching" and causing the woman actual bodily harm, and insists he was the victim of mistaken identity.
But Mr Daniells-Smith said "many witnesses" not only saw the defendant attack the woman but recognised him immediately as a “high profile sportsman”.