José M. Osorio / Chicago Tribune
Brett Jackson runs to third base and is safe with a triple during a spring training game in 2009. 
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The Cubs sent former first-round draft pick Brett Jackson to Arizona on Thursday night for reliever Blake Cooper.
Cooper, 26, is 16-15 with a 3.27 ERA in 192 relief appearances over five minor league seasons with a 3.27 ERA. He was 4-2 with a 3.57 ERA in 41 appearances at Double-A Mobile and Triple-A Reno and was named to the Southern League All-Star team.
Jackson, a first-round pick in 2009, had a brief call-up to the Cubs in 2012, hitting .175 with 59 strikeouts in 120 at-bats. He was hitting .210 with five home runs this year at Triple-A Iowa.
