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.

Clay Buchholz makes first major league start in over a year

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The Diamondbacks selected the contract of pitcher Clay Buchholz from Triple-A Reno ahead of Sunday’s game against the Mets. It marked Buchholz’s first major league start since April 11 last season (also against the Mets) when he was a member of the Phillies. Shortly after that start, he was diagnosed with a partial tear of his flexor pronator mass and he ended up not being able to pitch the rest of the season.

Buchholz signed a minor league deal with the Royals but he opted out of his contract at the beginning of this month. The Diamondbacks signed him to a minor league deal a few days later, needing depth with a depleted starting rotation. Buchholz made two starts for Reno before getting the call Sunday.

Buchholz, 33, pitched well on Sunday against the Mets, lasting five innings and limiting the opposition to a run on two hits and a walk with two strikeouts. His only blemish was allowing a solo home run to Amed Rosario leading off the sixth. He was immediately relieved by T.J. McFarland afterwards.

It is not yet clear if Buchholz will get another turn through the D-Backs’ rotation.