On a long enough timeline the survival rate drops to zero. Water finds its level. Everything regresses to the mean. Insert your euphemism here. One of the things we notice with numbers is that over time they usually approach what we would have expected. Unfortunately for the Astros catchers, they are left with Christian Vazquez getting regular starts with Yainer Diaz out.
On Monday, we looked at the league average BPO and discovered that is currently sits at .663. Please feel free to go back and read that piece for a primer on bases per out. What we did there is look at the league average BPO, so that we can calculate and BPO+. Since we are introducing a new stat, I will also include OPS+ just to compare the two.
Obviously, that includes a ballpark adjustment for the three catchers as well. The Astros wound up with a 101 overall park factor so far on the season, so we multiply each player’s BPO by .995 (since half of their games are on the road) to get their BPO+. Obviously, some positions will naturally have more production than others. Let’s get this thing started.
Catcher BPO
| TB | BB | SB | HBP | Outs | BPO | BPO+ | |
| Yainer Diaz | 35 | 3 | 0 | 0 | 83 | .458 | 69 |
| Christian Vazquez | 33 | 7 | 0 | 0 | 65 | .615 | 92 |
| Cesar Salazar | 1 | 2 | 0 | 0 | 10 | .300 | 45 |
| Combined | 69 | 12 | 0 | 0 | 158 | .513 | 77 |
One of the things we do to measure the efficacy of numbers is to compare them with other numbers we know have value. Yainer Diaz has a 69 OPS+, Vazquez has a 98 OPS+, and Salazar has a -5 OPS+. It is important to note how OPS and BPO are different. OPS is a nice, quick reference for offensive production (it explains approximately 90 percent of the variance in run production), but it has some significant holes.
The primary hole is a math problem that is difficult to get around. A player like Ty Cobb will have a .360 batting average. That means he will have at least a .360 OBP and a slugging percentage of at least .360. That’s a .720 OPS before we have even accounted for anything outside of batting average. Granted, there are no Ty Cobb’s running around, but there is Luis Arreaz of the Giants.
He has a 132 OPS+ due in large part to a .328 average through May 17th. His .807 OPS is not that impressive when you consider that .656 of it is tied up in batting average. His BPO+ is actually 113. I would still rather have him on my team than not, but one is reminiscent of an all-star and the other is reminiscent of a solid regular. That is because one counts batting average twice and the other does it once.
Vazquez’s numbers in April were unsustainable. Every predictive stat told us that. Part of that is that the power numbers just didn’t match the quality of the contact. The other part is that he is a 35 year old catcher that is suddenly playing five games a week. Even those of us that were souring on Diaz ideally wanted a work share between them.
Critics would correctly point out that you can’t have an all-star at every position and these numbers do not account for the defensive contributions of the player. This is where I would point to another feature I write over Battle Red Blog called “The Value of Things.” The concept is the same as the lab. Every player has an appropriate value and when players get their appropriate value then teams are usually able to afford more reinforcements.
Thankfully, Dana Brown did not extend Yainer Diaz like we would have liked to have seen him do after 2023 and 2024. I’d imagine that he will not end up at a 69 BPO+ when the season ends. His OPS+ last season was a 93 and that seems like a reasonable target for him. His OPS+ has dropped every year from 2023 on and it might very well drop to 85 or 90 this season.
From 1980 to 1988, the Astros kept throwing Alan Ashby out as their primary catcher. Each year they kept telling themselves he would only be the guy until they found someone better. In ten seasons (counting 1979) as the primary catcher, Ashby sported a 101 OPS. Diaz will end up being very similar and when you consider the defensive issues, the Astros will continue on with Diaz much the same way they continued on with Ashby all of those years.
Diaz will only be the guy as long as he is affordable and there is no one else better. Once one of those two things ceases to be the case, he will no longer be the regular catcher. With Walker Janek getting off to a rough start in Corpus Christi, there might not be any reinforcements any time soon. Vazquez and Salazar are here as long as they are cheap. That leaves the expansive world outside of Houston to shop for an improvement.
The last consideration will be the collective bargaining agreement. There will almost certainly be changes to the service time issue and that could also come with changes to arbitration and free agency. Diaz currently makes 4.5 million in arbitration. No one gets a pay cut in arbitration. So, Diaz could end up being a non-tender candidate if things don’t improve drastically. Otherwise you are looking at likely six or seven million for a below average catcher. Based on what you see, what are your recommendations?