Marshall, 31, started the season on the DL with a shoulder issue. He had a similar problem last year and was limited to 10 1/3 innings. In his last full season (2012), Marshall had a 2.26 ERA in 75 2/3 innings for Cincinnati. To clear room on the roster, righty Curtis Partch was sent to Triple-A.
Span, 30, was on the 7-day concussion DL. He had gone 8-for-36 (.222) with three doubles and one home run in 10 games before getting hurt. Span hit .297/.327/.380 in 153 games in 2013. Outfielder Steven Souza was sent to Triple-A in a corresponding move.
The 32-year-old Stewart had minor knee surgery near the end of spring training. He came over in an offseason trade with the Yankees after hitting .211/.293/.272 in 109 games a year ago. Catcher Tony Sanchez was assigned to Triple-A to clear a roster spot.