Kevin Durant could sign with Under Armour for $30 million a year

Kevin Durant won't hit the free agent market until July 2016 but the NBA's Most Valuable Player is on the verge of landing a blockbuster endorsement deal which could influence his future on the court as well.

According to a person familiar with negotiations, Durant, whose seven-year, $60 million deal with Nike is expiring, could earn as much as $30 million annually if he signs with Under Armour Inc., whose headquarters are in Durant's home state of Maryland.

Nike and Adidas are also in talks with Durant, whose combination of brilliance on the court and marketability in the aftermath of his emotional MVP speech has made him the darling of Madison Avenue.