Davis, widely considered the best young fighter now in the Mayweather Promotions stable, fought mostly with his hands down, attacking from various angles, but unlike the masters of that type of style like Roy Jones and Prince Naseem Hamed, Davis rarely landed cleanly and was countered often by the traditional left jab, right hand attack of Fonseca. Fonseca weighed in at exactly 130 pounds. My fans and supporters, I apologise.
It left the 22-year-old unable to make a second defence of the title he'd won seven months ago, and gave rank outsider Fonseca the chance to win the surprisingly vacant belt.
Pundits have since criticized Davis for not taking the fight against Fonseca seriously, which typically leads to a boxer not making weight.
When Davis was announced as the victor, the crowd booed leaving Davis with a quizzical expression on his usually smiling face.
Davis showboated early on before being rocked in the seventh round.
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"Now he took advantage of this punch right here", Davis continued, apparently implying that Fonseca was exaggerating the effect of the back-of-the-head contact.
But the bout came to an underwhelming conclusion in the eighth round after Fonseca was hit with a short left hand to the back of his head which left him too groggy to continue, as he kneeled on the mat.
It was a weird performance for Davis, who hadn't done that much showboating or fought as sloppy in the ring in his past fights.
With his struggles to avoid exceeding the 130 pound weight limitation for this fight, Davis may have simply outgrown the junior lightweight division. Either way, he told Twitter he plans on becoming a champion again very soon. "I got the job done on a bad night, now I'm moving on".