Who is Glen Perkins?
http://www.baseballprospectus.com/article.php?articleid=5825
That "hard curveball" is only about a 78 mph curve...looking at limited Pitch f/x data, I think that his slider might be more of an out pitch. Regarding "durable," this is his first MLB start, it's coming at age 25, he's averaged under 5 IP/start in MiLB, and he had to be shut down due to a "sore shoulder" in 2007. His one PECOTA comparable who was an above-average MLB player is Tug McGraw, who found his niche as a closer after serving as a spot starter through his early twenties. Few of the readers here at TalkSox would recognize more than two or three of the comparables, because most of them crashed and burned or wallowed in mediocrity a decade or two back.
Perkins's 50th percentile PECOTA is a 2-4 W-L record and a 5.65 ERA, pitching mostly in relief. His work in AAA this spring is better, posting a 2.97 ERA in seven games, six of them starts. That would be an MLE ERA a little below 4.00.
Perkins has less of a platoon split than many LHP. He's actually had a reverse split thus far in his MLB career, as well as during his 2008 AAA time.
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Boston's disciplined, hard-hitting lineup should be able to handle Perkins. He's a decent pitcher, but he's not a rising superstar.
Let's hope that Matsuzaka can throw seven innings tonight to save the bullpen.