Is Aroldis Chapman’s drop in velocity cause for concern?

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Is Aroldis Chapman pitching hurt? Is he already being overworked? Cincinnati Reds catcher Ramon Hernandez seems to be concerned.

During the eighth inning of Wednesday’s 3-2 defeat to the San Diego Padres, Hernandez called pitching coach Bryan Price and trainer Paul Lessard to the mound after noticing the flamethrower’s velocity was way down.

This is what Hernandez told John Fay of the Cincinnati Enquirer:

“Yesterday, he threw what 93, 94″,” Hernandez said. “Then today, he’s throwing 91. He’s throws almost 100 over every pitch. Now, he can’t get up to 93. There’s got to be something. You can’t lose it in one day.”

A guy who threw a record 105-mph fastball last season suddenly unable to reach 93? Cue the alarm bells, right? Maybe not.

Chapman faced just two batters, allowing a walk and committing an error. He was removed after he recorded his lone out. But manager Dusty Baker said that was just a precaution, stating “he said he was OK, but that’s Cuban baseball.”

Hernandez also chalked it up to a young guy trying to be tough and pitch through pain and fatigue. He said he spoke to the 23-year-old pitcher, who was pitching for the fourth time in five days, and advised him that it can be better to miss a couple days then suffer an injury that puts him out of action for a longer stretch of time.

“He’s got a lot of stress …,” Hernandez told Fay, “I think he’s going to be OK.”

Reds fans certainly hope so.

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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.