Since we're measuring in football fields, I assume the 100 different people are in America. Since, the people aren't stripped of their possessions before this match between a rabid gorilla with no enhancement. And "winning" is consider overcoming or neutralizing an obstacle.
The easy answer is the person with a conceal carry gun/weapon wins.
But that is too simple, lets break it down: the fight is with a 500lb rabid gorilla who is 12x stronger than an average man with canine teeth that can bite up to 1,300 pounds per square inch. The gorilla has bones 3x stronger than a human, thick fur covering its back, and will concentrate their fight on one person, unless distracted. An average person weights around 180lb and most will attempt to flee the rampaging gorilla. Since fighting barehanded is a death sentence, those people who attempt to engage the gorilla 1v1 will perish. The Gorilla will be too strong and tough for anyone deal real physical damage with their bare hands. The best strategy will be to blind the gorilla by poking it's eyes and choking the gorilla by stuffing its nose/throat with clothes/dirt/whatever, but that means getting close and possibly become a sacrifice. Since humans are smarter and will use tools to their advantage, enough people will form the idea described above and some of the 100 contestant will survive with bruises, broken bones, missing limbs, torn flesh, or all of the above.
But ultimately, the gorilla will be defeated.
Give this solution a 5 star to help future contestants.