Kris Medlen had what might be called plus-enthusiasm, not an official tool in the baseball parlance but a good one to have. You could see it in the way he pitched back when he first passed through Trustmark Park with the Mississippi Braves, and you could hear it in the way he talked about the game. The vibrant right-hander’s career came to a somber end on Saturday when he announced his retirement, at age 32, in the midst of his 13th pro season. He made one appearance with Arizona this year and was 0-5 with a 5.03 ERA at Triple-A Reno when he decided to call it quits. Two Tommy John surgeries — one in 2010, the second in 2014 — took a heavy toll on Medlen’s arm and his career, which at times was brilliant, drawing Greg Maddux comparisons. Medlen helped the M-Braves to their only Southern League pennant in 2008. He went 10-1 with a 1.57 ERA for Atlanta in 2012 and won 15 games for the Braves the next season. After missing the entire 2014 season, he signed with Kansas City and won a World Series ring with the Royals in 2015. Released by KC in 2016, Medlen got another shot with the Braves in 2017. He made a couple of appearances for the M-Braves that summer but didn’t get back to Atlanta. Arizona signed him this spring. His career MLB record is 41-26 with an ERA of 3.33 over parts of eight seasons. Nothing to hang your head about — and surely Medlen isn’t doing that.