This a very subjective question. There have been a lot of fighters in the past who have quit, while just fighting in the motions without giving their all or their best. I'll say Andrew Golota.
Oliver Mcall if you want to count the crying fiasco he did in the Lennox rematch...
He never quit, he stood there and let Lewis hit him man, he was psyching himself up to knock Lewis's ass out again when the referee randomly stopped it for no apparent reason.
Lewis couldn't knock McCall out with a bag of bricks.
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