UCLA filed a lawsuit against Under Armour on Wednesday in U.S. District Court in Los Angeles for breach of contract, seeking damages in excess of $200 million.
Under Armour announced in late June that it was ending its deal with the university.
The two sides were four years into a 15-year deal worth $280 million, which remains the highest in college athletics.
Under Armour paid $11 million per year in rights and marketing fees as well as contributing $2 million per year to aid in facility improvements.
Under terms of the contract, the company is supposed to supply $6.85 million in athletic apparel, footwear and uniforms.
The company cited Force Majeure due to the coronavirus pandemic as one of the reasons it was terminating the deal.