Astros hanging on to Jason Castro for now

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Back in January, the Astros avoided arbitration with catcher Jason Castro, agreeing to a one-year deal worth $2.45 million. Prior to the agreement, there was some speculation that the Astros would sign him to a multi-year extension, buying out all three of his arbitration years and likely at least one year of free agency. If an agreement couldn’t be reached, they could explore trading Castro and fall back on prospect Max Stassi.

GM Jeff Luhnow, however, is quite happy with Castro and what he brings to the table, even if his future isn’t known. Via Brian McTaggart of MLB.com:

Luhnow said several teams called him to ask about acquiring Castro this past offseason, but he said when you put the entire package together — what Castro does off the field and the leadership he provides and his links to the past — the organization decided that Castro had too much value.

“We take all of those elements into account, and we really feel he’s a player we can’t be without at this point,” Luhnow said. “I think he’s exceeded expectations, even internally for the people that drafted him in the first round. He’s a left-handed-hitting catcher with power and good defensive skills. He’s been injured here and there, but by and large, he’s everything you hope for in a first-round pick.”

According to FanGraphs, among catchers with at least 300 plate appearances last season, Castro was the fourth-most valuable out of 32 qualified catchers at 4.3 Wins Above Replacement. He trailed only Yadier Molina, Joe Mauer (now a first baseman), and Buster Posey. Clearly, the Astros have a major asset on their hands, but one can understand the thought process behind trading him, as the Astros are still at least two seasons away from being competitive.

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.