Why aren’t more MLB general managers former MLB players?

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As a follow-up to Ruben Amaro Jr.’s recent four-year contract extension with the Phillies, Jayson Stark of ESPN.com has an interesting article about how only three of the 30 current general managers played in the big leagues.

Amaro is one, along with Kenny Williams of the White Sox and Billy Beane of the A’s. And together they had a total of 536 career hits. Amaro, Williams, and Beane have all had considerably more success as GMs, so why aren’t more former players getting the gig?

I think one big reason is that being a GM is about far more than just signing players and making trades. Back when Terry Ryan stepped down as GM of the Twins in late 2007 he talked about still loving the player-evaluation part of the job, but no longer wanting to have the other responsibilities that came along with it. And his replacement, Bill Smith, has focused more on those “other” aspects of being a GM while his top assistant, Rob Antony, and various other front office members take on a bigger role in player evaluation.

Minnesota is just one example, of course, but my sense is that applies to many and perhaps even most teams across MLB. When fans think of a GM they may imagine a guy making phone calls to other teams, sitting down with agents to hammer out contract details, and talking to scouts about which players they ought to target. In reality there’s a lot more “general” managing going on, and while many former big leaguers are no doubt very good at evaluating players they may not be quite as good at running the day-to-day or business side of things. Or at least not as good as the increasing number of Ivy League-educated GMs.

Obviously some GMs thrive at both aspects of the job, and it’s probably not a coincidence that Amaro and Williams both attended Stanford University and Beane was headed to Stanford prior to signing with the Mets out of high school. In many ways they’re extremely smart guys who just happen to be former players. I’m sure there are many more than three guys capable of hitting a curveball and being the face of a huge organization, but the modern GM job calls for a lot more than just deciding who to sign or trade and playing baseball at the highest level isn’t necessarily the best way to prepare for those other responsibilities.

Aledmys Diaz is trying to improve his defense with strobe glasses

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MLB.com’s Jenifer Langosch reports that Cardinals’ shortstop Aledmys Diaz has been sporting a new look around Busch Stadium with a pair of “strobe glasses,” technology-enhanced specs designed to help athletes focus on the ball. Like a strobe light, the lenses of these glasses affect a player’s vision by rapidly changing opacity, giving its wearers the illusion that the objects they see are moving more slowly than normal. Once a player adjusts to the new speed of play, they gain a greater sense of control and are able to time their actions with more precision.

Diaz isn’t the first MLB player to utilize the technology, just the first Cardinals’ player to do so. It’s been tested by Bryce Harper, Corey Brown, Tommy Joseph, Austin Hedges and Joe Mauer, among others around the league, and has been used for everything from refining a catcher’s reflexes behind the plate to tweaking a hitter’s ability to track a pitch. Per Langosch, Diaz has been using the glasses to hone in on the ball during pregame drills, increasing both his confidence and response time on the field and improving his defense at short.

The shortstop has been the focus of some concern this season after seeing a sizable dip in his production at the plate, and his five fielding errors, 0.6 UZR and 0.6 fWAR haven’t helped matters, either. He sustained a minor thumb injury during an at-bat on Friday night, and was left off of the Cardinals’ starting lineup on Saturday, though manager Mike Matheny didn’t rule out his ability to pinch-hit during the series. While the strobe glasses are a good start, Diaz will need more than a pair of specs to match the spotlight-worthy performance he turned out during his rookie season in 2016.

Eduardo Rodriguez could rejoin the Red Sox rotation in July

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Red Sox’ left-hander Eduardo Rodriguez may finally get a chance at cracking the rotation again, assuming all goes well in Double-A Portland first. Rodriguez took the field prior to the club’s afternoon session with the Angels, firing 68 pitches in a simulated game as he prepared for an upcoming rehab assignment in Portland on Thursday.

The 24-year-old southpaw suffered a right knee subluxation during pregame warmups on June 1, and it’s been a slow path to recovery ever since. It’s not the first time Rodriguez has had issues with his right knee — he sustained a similar injury during spring training last year — and this time around, the Red Sox weren’t about to gamble with their starter’s health. Ian Browne of MLB.com reports that Rodriguez was put in a knee brace and underwent exercises designed to help him regain some mobility and stability while he worked back up to full strength on the mound.

He’ll still need to prove he can throw a 75- to 80-pitch outing in Double-A, and barring any significant setbacks, will likely rejoin the Red Sox’ pitching staff when they visit the Rangers next month. In the meantime, the club will continue to cycle starters through the No. 5 spot, which has seen no fewer than three different pitchers since Rodriguez hit the disabled list. The lefty is 4-2 in 10 starts this season after logging a 3.54 ERA, 3.1 BB/9 and career-high 9.6 SO/9 through his first 61 innings.