Gasper is out of the lineup for Wednesday's game against the Rockies, Tim Healey of The Boston Globe reports.
Gasper is a switch-hitter, but he's fared much better against right-handed pitching both this season and throughout his big-league career. The Red Sox will thus keep Gasper on the bench for a second straight day while the Rockies send another lefty starter (Kyle Freeland) to the hill.