McCarthy spent the past two seasons with the Oakland A's and was the opening-day starter in 2012. After missing the entire 2010 season, he had a career-year in 2011 with a 9-9 record and 3.32 ERA. His performance earned him a second one-year contract in Oakland for this past season and McCarthy finished 8-6 with a 3.24 ERA in 18 starts.
McCarthy's season, however, ended prematurely after being hit on the head by Erick Aybar's line drive, requiring emergency brain surgery. His recovery is going as planned and McCarthy expects a normal offseason, making him a sought-after free agent.
The Diamondbacks' starting pitchers recorded a 4.26 ERA in 2012, a mark that placed them 19th in baseball. Arizona finished third in the NL West with an 81-81 record.