As planned, the Pirates have activated right-handed starter A.J. Burnett from the 15-day disabled list.
He will start for the Pirates on Sunday afternoon against the Cubs after sitting out for the past three-plus weeks because of a strained right calf muscle.
Burnett has registered a fantastic 3.12 ERA and 1.13 ERA in 14 starts this season, fanning 99 batters and issuing only 35 walks in 89 1/3 innings. The 36-year-old Arkansas native owns an impressive 3.39 ERA, 1.21 WHIP and 8.6 K/9 in 291 2/3 total frames since joining Pittsburgh via a trade from the Yankees before the start of the 2012 campaign.
The Pirates enter play Sunday with one-game lead over the Cardinals in the National League Central.