The Pittsburgh Pirates have claimed minor league right-handed pitcher Steven Jackson off waivers from the New York Yankees organization. To make room on the 40-man roster, right-handed pitcher Jimmy Barthmaier was unconditionally released. The 27-year-old Jackson was 0-0 with one save and a 1.88 ERA in seven games (one start) this year for the Triple-A Scranton-Wilkes Barre Yankees before being designated for assignment on May 8. Jackson, who was optioned to Triple-A Indianapolis, was scored upon twice in his six relief appearances with Scranton-Wilkes Barre before allowing one run in 4.0 innings in his start and final appearance on May 7 at Indianapolis.