Hisashi Iwakuma continues to quietly dominate

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It’s tough to get much attention when AL ERA leader Felix Hernandez is your teammate, but Hisashi Iwakuma is quietly emerging as a formidable sidekick at the top of the Mariners’ rotation.

Iwakuma gave up two runs over seven innings last night in a 6-3 win over the Athletics. The 32-year-old struck out nine and walked none while retiring 16 batters in a row at one point. Brooks Baseball notes that he had 12 swings and misses, including five on his splitter, which has emerged as a legitimate weapon during his brief time in the majors.

Just to give you a sense of how good Iwakuma has been this season, his ERA actually went up from 1.61 to 1.74 with last night’s start. Still, he hasn’t allowed more than three runs in any of his eight starts this season and owns a stingy 51/8 K/BB ratio over 51 2/3 innings. His 0.74 WHIP is the best in the American League. And to think, he has pitched most of the season with a blister on the middle finger of his throwing hand.

Iwakuma’s dominance actually dates back to last season, as he has a 2.33 ERA in 24 starts since moving to the rotation last July. Only Justin Verlander, Clayton Kershaw, Matt Harvey, and Kris Medlen have a lower ERA in the same timespan. It’s unlikely that he’ll be able to maintain his .198 batting average on balls in play (BABIP) and 84.4 percent strand rate, so some regression should be expected, but the Mariners’ decision to keep him around on a two-year, $14 million deal looks pretty smart right now.

Cardinals closer Trevor Rosenthal to be examined for arm tightness

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Cardinal closer Trevor Rosenthal was taken out of last night’s game against the Red Sox after he gave up a big homer and a walk. He velocity was down as well, and Mike Mathney said after the game that he didn’t look right. Now the Cardinals are going to take a closer look at him, and he’ll be examined today for what is being described as “tightness” in his right arm.

Rosenthal is 3-4 with a 3.40 ERA and a K/BB ratio of 76/20 in 47.2 innings. He has 11 saves after regaining the closer’s job from Seung Hwan Oh. Now some combination of Oh, Tyler Lyons, and John Brebbia will fill in for Rosenthal to the extent he needs to miss time.

Aaron Judge broke a dubious record last night

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Aaron Judge hit a monster home run in last night’s win over the Mets, but he also set a dubious record. Judge struck out for the 33rd consecutive game, setting a new mark for a position player in a single season.

Yes, that’s qualified. No pitchers, of course, as I assume many of them have struck out in more than 33 straight games. Also,  Adam Dunn once struck out in 36 straight games, but that straddled two seasons: he struck out in the final four games of 2011 and the first 32 games of 2012. Still, Judge’s feat is impressive, and given the nature of his game and the state of baseball these days, it’s not hard to imagine him striking out in three or four more straight games anyway.

None of which, by the way, should be all that much of a slight on Judge. The guy is still hitting .291/.420/.614, even with his second half slump. If I was a manager I’d happily accept his whiffs in exchange for everything else he brings to the table. It’s not 1959 anymore, and strikeouts are not the worst thing that can happen.