Smoltz, who turns 42 in May, threw to a crouching catcher for just the second time since having surgery to repair a torn labrum on June 10.
Smoltz signed with Boston in January, ending his 20-year tenure with the Atlanta Braves. He has played catch off a mound this spring.
Smoltz threw 30 pitches from a windup and 10 from the stretch position. He is scheduled for another bullpen session Saturday with approximately the same number of pitches.

Boston Red Sox pitchers John Smoltz, right, and Tim Wakefield work out prior to their spring training baseball game against the Minnesota Twins in Fort Myers, Fla. , Tuesday March 17. / photo: Associated Press
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