Mariners' Brian O'Keefe: Added to training roster By RotoWire Staff Jun 29, 2020 at 10:02 am ET1 min read O'Keefe will be part of the Mariners' 60-man training roster.O'Keefe, 26, hit .229/.319/.389 with 13 home runs at Double-A in 2019 as a member of the Cardinals' organization. He is unlikely to see much, if any, time in the majors this season. Fantasy Baseball Today Newsletter You're destined to gain an edge over your friends with advice from the award-winning FBT crew. I agree that CBS Sports can send me the "Fantasy Baseball Today Newsletter" newsletter. See All Newsletters Please check the opt-in box to acknowledge that you would like to subscribe. Thanks for signing up! Keep an eye on your inbox for the latest sports news. Sorry! There was an error processing your subscription.