Yankees' Aaron Boone mute on Luis Severino's MRI resultsSeverino suffered a setback after dealing with shoulder tightness8/16/2021, 8:38 PMScott ThompsonEditorial ProducerNew York Yankees pitcher Luis Severino began his rehab assignment with the Somerset Patriots on Tuesday night against Bowie. / © Alexander Lewis / MyCentralJersey via Imagn Content Services, LLC
