The Kansas City Chiefs made sure they’ll have Super Bowl MVP Patrick Mahomes around as long as possible. Mahomes agreed to a 10-year extension worth $503 million, according to his agency, Steinberg Sports. The deal is worth $477 million in guarantee mechanisms and includes a no-trade clause and opt-out clauses if guarantee mechanisms aren’t met. It’s the richest contract in professional sports history, surpassing Mike Trout’s $426.5 million deal with the Los Angeles Angels.