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Patrick Mahomes agreed to terms on a 10-year contract extension that would make him the longest-tenured quarterback in Kansas City Chiefs history, according to a tweet by ESPN's Adam Schefter.
The deal will be the richest contract in National Football League history, according to Schefter. An ESPN article said that the deal is worth $450 million and could be worth up to $503 million.
Mahomes, who turns 25 in September, still has two years left on his original contract, so a 10-year extension would…