The A's acquired infielders Jake Fox and Aaron Miles on Thursday from the Cubs in exchange for right-hander Jeff Gray and Minor Leaguers Matt Spencer and Ronny Morla. Fox, who played four positions with the Cubs this year, batted .259 with 11 homers and 44 RBIs in 82 games and had 17 homers at Triple-A Iowa. Miles, who signed a two-year deal with the Cubs prior to the 2009 season, hit a career-low .185 while struggling with injury, coming off a .317 season with St. Louis the year before. The A's also received cash considerations in the deal.