Mariners outfielder Mitch Haniger is expected to miss the start of the regular season and likely needs core muscle surgery. General manager Jerry Dipoto says Haniger suffered an injury during one of his offseason workouts. Dipoto says the latest setback is tied to Haniger's injury issues from last season. Haniger missed the final 3 1/2 months of the season after suffering a ruptured testicle and then experiencing back issues during his recovery. Haniger could be ready to join the major league club by late April. Haniger was an All-Star in 2018.