Brian Matusz has a 9.84 ERA and the highest homer rate ever

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Brian Matusz had the shortest start of his miserable season yesterday, recording just four outs while allowing five runs against the Yankees.

He threw 176 innings with a 4.30 ERA as a 23-year-old rookie last season, but instead of establishing himself atop the Orioles’ rotation Matusz is 1-7 with a 9.84 ERA in 10 starts and spent much of the season in the minors.

President of baseball operations Andy MacPhail indicated that yesterday was probably Matusz’s final start of the season, admitting to Brittany Ghiroli of MLB.com that “I don’t know that he’s doing us any good or we’re doing him any good” by remaining in the rotation to take a beating every five days.

Buck Showalter wouldn’t commit to Matusz’s status either way, but the left-hander has coughed up 48 runs in 43 innings while allowing opponents to hit .364 with a .679 slugging percentage. To put that in some context, consider that Jose Bautista is hitting .306 with a .632 slugging percentage.

As part of his overall struggles Matusz is in historic territory when it comes to serving up homers. He’s surrendered 15 long balls in 43 innings for a rate of 3.1 homers per nine innings, which is the highest homer rate in baseball history among all pitchers with at least 10 starts. If he were to somehow throw 200 innings at that rate it would equal 70 homers.