The D-backs acquired right-hander Frank Duncan from the Pirates on Friday for infielder Phil Gosselin, who had been designated for assignment on Tuesday.
The 25-year-old Duncan was 12-8 with a 2.34 ERA in 27 games (22 starts) last season between Double-A Altoona and Triple-A Indianapolis. He will be a non-roster invitee to the D-backs' Major League camp at Spring Training.
Gosselin, 28, appeared in 146 games with the D-backs in 2015-16, hitting .283 with 17 doubles, two triples, five home runs and 26 RBIs. He is a .283/.331/.385 career hitter in parts of four seasons with the Braves and D-backs.