Marlins demote Derek Dietrich because of his defense

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Derek Dietrich has been the Marlins’ starting second baseman since being called up from the minors in the middle of last season and he’s actually hit well this year with a .773 OPS in 41 games, but he’s been demoted back to Triple-A because the team thinks his defense is terrible.

Dietrich has seven errors, which is tied for the MLB lead among second basemen, and Manny Navarro of the Miami Herald writes that he “has had plenty of defensive struggles” even beyond the error total. Ultimate Zone Rating agrees, pegging Dietrich as 9.0 runs below average in 800 career innings at the position.

But still: 24-year-old middle infielders with a .773 OPS don’t grow on trees and Dietrich’s defensive numbers aren’t considerably worse than plenty of other regulars with good bats. He’s a former Rays second-round draft pick who was acquired by the Marlins in exchange for Yunel Escobar and certainly seems good enough to remain in their long-term plans.

Three A’s rookies hit their first big league home runs on Saturday

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The Athletics followed Friday’s 3-0 shutout with a rookie-led home run derby on Saturday afternoon, watching not one, not two, but three rookies belt their first major league home runs off of the White Sox’ James Shields.

Right fielder Matt Olson was the first to strike, taking Shields deep on a first-pitch, two-run blast in the first inning for his first home run in 49 major league plate appearances:

Fellow outfielder Jaycob Brugman duplicated his teammate’s results in the second inning with a solo home run, his first extra-base hit of any kind since he made his debut on June 9:

In the third, with a comfortable 4-0 lead backing two scoreless frames from Oakland right-hander Daniel Gossett, Franklin Barreto took his shot at Shields. After getting the call several hours prior to Saturday’s game, he became the fastest of the three rookies to record his first big league homer, going yard on a 2-2 changeup and driving in Bruce Maxwell to give the A’s a six-run advantage.

The Athletics currently lead the White Sox 8-2 in the top of the sixth inning.

Athletics call up top prospect Franklin Barreto

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The Athletics called up their top prospect on Saturday, inserting shortstop Franklin Barreto into the lineup for their second game against the White Sox. Barreto was originally scheduled to make his major league debut on Sunday, but got a head start after Jed Lowrie sustained a minor knee sprain in Friday’s 3-0 win and was scratched from Saturday’s lineup.

Barreto, 21, has been rapidly climbing the rungs of the A’s minor league system after getting dealt by the Blue Jays in 2014. He got his first taste of Triple-A action late last year, going 6-for-17 with three RBI and getting caught stealing in two attempts. He fared little better this spring, slashing .281/.326/.428 with eight home runs and a .754 OPS through his first 309 PA in Nashville.

While his minor league production has been solid, if underwhelming for a prospect of his caliber, the A’s are expected to give the rookie infielder a long leash with both Marcus Semien and Chad Pinder sitting on the disabled list. Pinder landed on the 10-day DL after suffering a left hamstring strain on Friday. Semien, meanwhile, is still working his way back from the 60-day DL with a right wrist fracture and likely won’t rejoin the team until he completes a rehab assignment with High-A Stockton.