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By Denver Nicks
May 3, 2016
Bryce Harper #34 of the Washington Nationals in action during the game against the Kansas City Royals on May 02, 2016 in Kansas City, Missouri.
Bryce Harper #34 of the Washington Nationals in action during the game against the Kansas City Royals on May 02, 2016 in Kansas City, Missouri.
Jamie Squire—Getty Images

Bryce Harper, the star right fielder for the Washington Nationals baseball team, has just signed an extension to his contract with the athletic apparel maker Under Armour, which is believed to be the biggest endorsement deal in baseball history, ESPN reports.

Under Armour announced the extension Tuesday but declined to release any details. An anonymous source “with knowledge of the deal” tells ESPN it’s a 10-year extension believed to be the biggest any MLB player has ever signed.

Harper, who at 23 became the youngest player ever to unanimously win an MVP award, has endorsed Under Armour since 2011.

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The purpose of this disclosure is to explain how we make money without charging you for our content.

Our mission is to help people at any stage of life make smart financial decisions through research, reporting, reviews, recommendations, and tools.

Earning your trust is essential to our success, and we believe transparency is critical to creating that trust. To that end, you should know that many or all of the companies featured here are partners who advertise with us.

Our content is free because our partners pay us a referral fee if you click on links or call any of the phone numbers on our site. If you choose to interact with the content on our site, we will likely receive compensation. If you don't, we will not be compensated. Ultimately the choice is yours.

Opinions are our own and our editors and staff writers are instructed to maintain editorial integrity, but compensation along with in-depth research will determine where, how, and in what order they appear on the page.

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