Houston Astros Yainer Diaz (21) reacts after striking out during the seventh inning of an MLB baseball game at Daikin Park, Thursday, April 16, 2026, in Houston.
Jason Fochtman/Houston Chronicle
A glaring element of Houston Astros catcher Yainer Diaz’s slow start at the plate is a high frequency of ground balls.
In his first 15 games, Diaz posted a 62% ground-ball rate on his 50 batted balls put into play. That was 16% above his rate last season and 18.5% above the league-wide rate entering Friday.
Driving the ball is central for Diaz, who hit at least 20 home runs in two of the last three seasons. He entered Friday with a .186/.222/.254 slash line and two extra-base hits in 63 plate appearances.
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The issue fueling his ground-ball rate is not thought to be swing mechanics, said Astros hitting coach Victor Rodriguez, but Diaz’s pitch selection – going after pitches lower than desired.
“Usually, up in the zone he stays through the ball better,” Rodriguez said. “I think it’s more about what he’s swinging at more than his swing.”
Manager Joe Espada offered a similar explanation when asked before Friday’s series opener against the Cardinals, for which Diaz was not in the starting lineup, about Diaz’s early at-bats.
“I think for me it’s more when he chases those pitches down in the zone and you see the ground balls, that’s not what you want out of Yainer Diaz,” Espada said. “We’re trying to work on a few things in his approach, just to help him be more consistent.”
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Diaz’s approach is an ongoing discussion. He has been one of the majors’ most aggressive hitters since his debut, a tendency no less true early this season. Diaz had the sixth-highest chase rate and fourth-highest swing rate among qualified hitters entering Friday.
Diaz has also been one of the game’s most productive offensive catchers in that stretch. From 2023-25, he ranked first in batting average (.279), fourth in slugging (.455) and fourth in home runs (59) among hitters who played primarily catcher.
His OPS has declined each of the last two seasons, however, since a 2023 season in which he posted a 128 OPS-plus. The Astros, meanwhile, made selectivity and discipline at the plate a teamwide priority this offseason and spring, with the last few weeks offering signs of progress.
Espada expanded Friday on what the ideal might be for Diaz, who has paired ultra-aggression with top-end contact ability through his career.
“Yainer Diaz has always been someone who likes to swing, and there’s nothing wrong with that, and we’re not asking him to always swing at strikes, because it’s almost impossible to do,” Espada said.
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“But there’s areas of the plate that he covers very well, so (if) he can focus in that area and stay in those areas, then he can do damage. But when he goes away from those red areas and goes to those blue areas (where) he doesn’t perform as well, that’s when he gets in trouble. So for us it’s just to remind him who he is – stay on this lane, go after those pitches and then you will have success.”
Rodriguez, hired in the offseason, said approach is a constant topic of the hitting coaches’ dialogue and work with Diaz. Diaz has been receptive and engaged in pregame work, Rodriguez said.
“Every day he comes to the cage, we talk about approach, how the guy’s going to pitch to him, what kind of approach he needs to compete against that person,” Rodriguez said. “We work on angles, if it’s a lefty (or) righty. I present to him situational hitting so he’s aware, he’s not just swinging. What kind of pitch do I need to swing at to have success in a certain situation? So, it’s a lot of things that we do.”
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This season’s sample size is still minute. Diaz collected five hits over two games April 3 and 4 against the A’s, then was 3-for-32 in his next eight games before Friday. His strikeout rate is still below average, but his 26% hard-hit rate is 18% below his career mark and he has barreled one of 50 balls put into play, per Baseball Savant.
Diaz dropped to the ninth spot in Espada’s order on Thursday, then was off Friday after catching back-to-back games. Rodriguez said Diaz has remained positive in the season’s first few weeks. Diaz “needs to make better swing decisions,” Rodriguez said, “but when he does swing at good pitches, he’s productive. So it’s a matter of guiding him towards that.”