Bryce Harper just got paid. Not by the Washington Nationals but by Under Armour.

The reigning NL MVP reportedly signed a 10-year extension with the sports apparel giant that is believed to be the largest endorsement deal in history for a baseball player, a source told ESPN’s Darren Rovell.

The deal was announced Tuesday by Under Armour. Harper shared the news via his Instagram.

Harper has been with Under Armour for five years now, and he’s not the only MVP under contract. Under Armour also has NBA MVP Stephen Curry, PGA Tour Player of the Year Jordan Spieth, NFL MVP Cam Newton and NHL MVP Carey Price.

In a short while, Harper has become the face of MLB, so it comes as no surprise that Under Armour was willing to make him an offer he couldn’t refuse. At age 23, he’s just getting started.