After a brief overhaul at Pearl Harbor, "Cotten" rejoined TF 58 for the invasion of the Marianas. She screened the carriers during air strikes on Saipan; sank a sampan 17 June; splashed a dive bomber making a run on during the Battle of the Philippine Sea of 19 and 20 June; and screened air strikes on Guam, the Palaus, Yap, Ulithi, and the Bonins.