The Pittsburgh Pirates have declined options on pitcher Paul Maholm, catchers Ryan Doumit and Chris Snyder and shortstop Ronny Cedeno.
The move allows each player to become a free agent.
Maholm was due $9.75 million in salary next season. The 29-year-old lefthander is 53-73 in seven seasons with the Pirates. He went 6-14 with a 3.66 ERA in 2011 and ended the season on the disabled list with arm trouble.
Doumit and Snyder battled injuries last season. Snyder hit .271 in 34 before going out with back problems while Doumit hit .303 with 30 RBIs in 77 games but missed all of June and July with a leg injury.
Cedeno hit .249 in 2011 but consistently found himself in manager Clint Hurdle's doghouse due to mental lapses.