TAMPA, Fla. — Jasson Dominguez’s spring training will dictate whether he’s on the Yankees’ Opening Day roster as a rookie starting left fielder or back in Triple-A, general manager Brian Cashman stated in the winter and at the start of camp. This statement usually has been accompanied with a prediction that the organization thinks Dominguez will be ready to handle left field at the start of the season after struggling there badly last season following a move from center.