Overrated: Yainer Diaz
The Houston Astros were certainly justified in finally bidding adieu to veteran backstop Martin Maldonado in 2024, belatedly handing the reins over to impressive youngster Yainer Diaz. While Maldonado was considered the better defender — a questionable claim toward the end of his Astros tenure — it was impossible to dismiss the obvious offensive upgrade any longer.
The change was, as expected, a net positive for Houston. However, there are troubling warning signs that Diaz may not be the solution for long.
Diaz was never billed as a strong defensive catcher — and 2024’s poor showing proved why — so he will have to rely on his offensive production to carry his value. Thankfully, that has worked out well in his first two full seasons. He posted a .293/.318/.478 slash line over 2023-2024, good for a 121 wRC+ that put him behind only the Contreras brothers for third among MLB catchers.
That two-year production may not be sustainable, however, as it’s hoisted up by a .322 Batting Average on Balls in Play (BABIP), including a .338 BABIP in 2024. A regression to the mean would not be surprising, and with it would come a more critical look at his horrendous chase rate. Diaz is an aggressive hitter, with a 3.5% walk rate (BB%) over 2023-2024 that ranks last among catchers with at least 250 PA.
An extreme tendency to chase is good news to pitchers and bad news for Diaz. Making adjustments will be crucial, or else the league will exploit his weakness as much as possible. If that happens, not only will his walk rate continue sinking, his strikeout rate may climb as well. If those trends combine with more batted balls finding gloves than grass, the Astros may soon have another catcher dilemma on their hands.