Ledezma was 0-3 with a 6.86 ERA in 27 games, allowing 25 hits in 19 2/3 innings. He gets a salary of $700,000 in the major leagues next season and $300,000 in the minors.
The Pirates also activated Opening Day first baseman Jeff Clement from the 60-day disabled list Wednesday and assigned him outright to Triple-A Indianapolis. Also sent outright to Indianapolis were right-handers Sean Gallagher and Steven Jackson, left-hander Justin Thomas and outfielder Brandon Moss.
Moss, a starter for part of the 2009 season, batted .154 with no homers and two RBIS in 17 games during a late-season call-up with Pittsburgh.