(Reuters) - Under Armour Inc signed a 10-year contract with Major League Baseball to be its official uniform supplier, the sportswear maker's first such deal with a professional league. The company will become the exclusive provider of all on-field uniform components including jerseys, game-day outerwear and year-round training apparel for all 30 MLB clubs beginning in the 2020 MLB season, replacing Majestic Athletic. "This is a watershed moment for the Under Armour brand," Chief Executive Kevin Plank said in a statement.
