The St. Louis Cardinals are further bolstering their starting rotation for the stretch run. MLB Network reports the Cards have acquired right-hander John Lackey, minor league pitcher Corey Littrell and cash from the Boston Red Sox in exchange for pitcher Joe Kelly and first baseman/outfielder Allen Craig. Lackey is 11-and-7 with a 3.60 ERA this season. The 26-year-old Kelly is 2-and-2 with a 4.37 ERA in seven starts this year. Craig is batting .237 with seven homers and 44 RBI. St. Louis acquired right-handed starter Justin Masterson from the Cleveland Indians on Wednesday. Due to a clause in his contract, the Cardinals are getting newly-acquired starting pitcher John Lackey for relatively cheap. When Lackey signed his five-year deal with the Red Sox in December of 2009, there was a clause for a club option for the league-minimum salary in 2015 if he underwent elbow surgery between 2010-and-2014. The clause was triggered when Lackey underwent Tommy John surgery in 2011. St. Louis can now pick up the club option on Lackey for 500-thousand-dollars this offseason for next year.