Dave Bush has opted out of his minor league deal with the Cubs to become a free agent, according to Bruce Miles of the Daily Herald (on Twitter).
The Cubs signed Bush last month after Texas designated him for assignment and released him. The 31-year-old posted a 5.79 ERA with 5.5 K/9 and 2.2 BB/9 in 37 1/3 innings for the Rangers as a middle reliever and spot starter this year.
Though Bush pitched primarily out of the bullpen for the Rangers, he returned to the rotation for the Iowa Cubs. In 22 Triple-A innings, Bush posted a 6.14 ERA with 4.9 K/9 and 3.7 BB/9 before opting out of his contract.
