"Brett Anderson gave himself an "A-plus" on Monday after throwing his first bullpen session since his Tommy John surgery July 14.

Anderson, who could be back in the rotation in the second half of the season, threw 25 fastballs, 10 from the front of the mound and 15 from the rubber.

"For a first time, that's about as good as you could hope for," Anderson said.

Anderson will throw bullpens about once a week initially, according to manager Bob Melvin, who was impressed with Anderson's initial session."