Ulnar artery aneurysms are uncommon lesions. They are often caused by traumatic injury to the hand. Ulnar artery aneurysms have been reported in association with multiple sports-related activities, but never secondary to a basketball injury. The following is a case presentation of an ulnar artery aneurysm likely formed secondary to repetitive basketball slam dunking with accompanying review of diagnosis and surgical treatment of ulnar artery aneurysms.