Injured Red Sox reliever Carson Smith (acquired from Seattle in the Wade Miley trade) began his rehab program yesterday by throwing out to 120 feet. Smith is suffering from a flexor-muscle strain that happened back on March 21st. There is no specific timetable for Smith's return to action—but realistic estimates are for a late May activation. It will be interesting to see if the back-end of the Red Sox bullpen can remain effective in Smith's absence—who was counted upon to be in the early part of the 7th-8th-9th inning "set-up" rotation.