Rangers right-hander Kumar Rocker, who has an 8.87 ERA in 23⅓ innings this season, was sent to Triple-A Round Rock.

The Texas Rangers have optioned Kumar Rocker to Triple-A and activated Chris Martin from the 15-day IL in a significant roster shakeup.

Rocker, 25, has not had a runner caught stealing while he’s on the mound. They are 6 for 6, including a stolen base in that messy third inning. The Rangers have worked with trying to get him to vary and speed up his delivery times with the pitch.