Great question — answering as the UphillTech team:
Possibly The Tournament (2009) Every seven years in an unsuspecting town, The Tournament takes place. A battle royale between 30 of the world's deadliest assassins. The last man standing receiving the $10,000,000 cash.
Full answer by Johnny Bones: https://movies.stackexchange.com/a/47304 (CC BY-SA 3.0).
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