MLB star Mike Trout is finalizing a contract extension with the Los Angeles Angels that, once official, will be the largest contract in professional sports history. The deal is reportedly worth $430 million over 12 seasons and does not include any opt-out clauses, which means the superstar center fielder will likely spend the rest of his career with the team that drafted him out of high school. It's been a high-profile offseason for the MLB, which also signed massive free agent deals with Manny Machado and Bryce Harper. Trout's landmark deal reflects his strong record: The 27-year-old has already tallied 240 career home runs and won two MVP awards.

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