Aaron Cook has a 1.33 ERA at Triple-A, can opt out of Red Sox contract on May 1

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Aaron Cook turned in another strong start at Triple-A yesterday, allowing one unearned run in seven innings, and now sports a 1.33 ERA after four starts in Pawtucket.

Cook has a clause in his minor-league contract with the Red Sox that allows him to opt out and become a free agent again if he’s not in the majors by May 1, although he could choose not to use it and give Boston a bit more time to make a decision on his status.

Cook offered no hints about which way he’s leaning, telling Rob Bradford of WEEI.com: “I’ll make a decision when I feel like it’s time to make a decision. I haven’t made a decision yet.”

Obviously a 33-year-old veteran dominating Triple-A competition doesn’t mean he’s ready to do the same in the majors, but Cook looks like his old, pre-injury self with a low-90s fastball and tons of ground balls. In a decade with the Rockies he posted a 4.53 ERA in 1,312 innings, including a 4.39 ERA away from Coors Field, so if the Red Sox don’t think they can use him as a fourth or fifth starter there should be at least a few other teams that see a better fit.