The Cubs activated right-handed pitcher Tyler Chatwood from the paternity list and optioned right-hander Dillon Maples to Triple-A Iowa ahead of Thursday's game against the Dodgers in Los Angeles.
Chatwood, 28, was placed on the paternity list on Monday. He is 3-5 with a 3.95 ERA in 14 starts this season. He last pitched on June 19 against the Dodgers, allowing one run on two hits in five innings. In seven Major League seasons with the Angels (2011), Rockies (2012-14, 2016-17) and Cubs, he has gone 43-51 with a 4.27 ERA in 144 games, including 127 starts.
Maples, 26, pitched two scoreless innings on Wednesday in his first appearance with the Cubs this season. He allowed no hits and struck out three batters while walking two and hitting one batter. In 26 outings for Iowa this season, he is 2-2 with five saves and a 3.20 ERA in 26 relief appearances.