Grant Balfour needs knee surgery, out 4-6 weeks

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How quickly spring training shifts from the “Best Shape of His Life” stage to the “Players Being Injured” stage.

A’s closer Grant Balfour will miss 4-6 weeks following surgery to repair a torn meniscus in his right knee, which apparently bothered him at the end of last season and then continued to be an issue when he started throwing this week.

Balfour might have time to be ready for Opening Day and if not he shouldn’t miss many games. Oakland has good bullpen depth anyway, with Ryan Cook and Sean Doolittle as the most likely fill-in closers.

Balfour came into last season with just 10 career saves through age 33, but saved 24 games with a 2.53 ERA and 72 strikeouts in 75 innings. Dating back to 2008 he has a 2.78 ERA in 318 innings while holding opponents to a .191 batting average.

Report: Glen Perkins will retire from baseball

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According to MLB.com’s Rhett Bollinger, Twins GM Thad Levine told 1390 Granite City Sports that reliever Glen Perkins will retire.

Perkins, 34, has battled shoulder injuries over the last two years, limiting him to a total of 7 2/3 innings between 2016-17. His decision doesn’t come as much of a surprise given the circumstances. The Twins declined his $6.5 million club option back in October, making him a free agent.

Across parts of 12 seasons, all with the Twins, Perkins compiled a 3.88 ERA with 120 saves and a 504/158 K/BB ratio in 624 1/3 innings. He ranked among baseball’s best closers from 2013-15, racking up 102 of those saves with a 3.08 ERA. The lefty made the American League All-Star team in each of those three seasons.