The Atlanta Braves are moving left-hander Jo-Jo Reyes to the bullpen and calling up right-hander Kris Medlen to take his place in the rotation.Manager Bobby Cox said Friday that Medlen, who is 5-0 with a 0.96 ERA at Triple-A Gwinnett, will be called up to start Tuesday against Colorado.Medlen is receiving the promotion instead of top prospect Tommy Hanson, who is 1-3 with a 1.99 ERA at Gwinnett.Medlen has allowed only 19 hits while striking out 44 batters in 37 1-3 innings.Reyes is 0-2 with a 6.58 ERA in five starts.