Joe Nathan is showing major signs of decline at age 39

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Joe Nathan has been one of the best closers in baseball for a decade, saving 354 games with a 2.85 ERA, but at age 39 he’s finally showing signs of decline in his first season with the Tigers.

Nathan saved 43 games with a 1.39 ERA and 73 strikeouts in 65 innings for the Rangers last season, which convinced the Tigers to give him a two-year, $20 million contract as a free agent, but now he’s got a 6.86 ERA with four blown saves and two losses.

Nathan continues to miss a fair number of bats with 20 strikeouts in 21 innings, but he’s walked 11 batters and served up four homers. And perhaps most worrisome is that his average fastball velocity is down to 91.4 miles per hour compared to 94.0 mph in 2012 and 92.2 mph last season.

Predictably, the struggling closer told Jason Beck of MLB.com that he’s confident about turning things around:

This isn’t the first time I’ve gone through a funk and come out the other end. I’ve dealt with two injuries. I’ve pitched much worse than this, trust me. I’ve pitched much worse than this in Triple-A, got sent down to Double-A, got my butt back to the big leagues. I think having dealt with that, having–not the confidence, but at least the experience of knowing I can come back through this stuff definitely helps.

He’s right about coming back from a lot in his career, including Tommy John surgery in 2010 at age 35, but unfortunately Father Time remains undefeated and Nathan’s struggles appear to be more than simply bad luck or a rough patch. As a Twins fan who got to see Nathan dominate for a half-dozen years I’d love to be wrong, though.

The Twins and Diamondbacks make a minor trade

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The Arizona Diamondbacks have announced that they’ve acquired minor league catcher John Ryan Murphy from the Minnesota Twins in exchange for minor league pitcher Gabriel Moya.

Murphy has played in 141 major league games across four seasons, three with the Yankees, one with Minnesota. He has spent the entire 2017 season at Triple-A, hitting .222/.298/.330 with four home runs and 27 RBI over 59 games. Which is not significantly different than what he did in the bigs. He’s 26 and will serve as organizational depth for Arizona.

Moya is a 22 year-old lefty who has been the closer for the Dbacks’ Double-A team. He’s had a fantastic 2017 season, posting a 0.82 ERA and a 68/12 K/BB ratio in 43.2 innings.

The Rays acquire reliever Dan Jennings from the White Sox

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The White Sox have traded multiple relievers recently. They just traded another, sending lefty Dan Jennings to the Rays for first baseman Casey Gillaspie.

Jennings has a 3.45 ERA and a 38/19 K/BB ratio in 44.1 innings. He’ll likely serve as a setup man with Tampa Bay. He’s more than a rental, as he’s under team control for two more years.

Gillaspie, 24, is hitting .227/.296/.357 with nine home runs in 395 plate appearances at Triple-A. He hit much better in 2016 at Triple-A, however, and made it on some top-100 prospects lists. What the White Sox’ plans for him are with Jose Abreu around, however, are unclear.