I asked ChatGPT to compare the 2010 and 2025 bullpens
Here’s how the Arizona Diamondbacks’ bullpens compare:
2010 Diamondbacks Bullpen
- Reliever ERA: 5.74 — highest among NL teams since 1998
- ERA–: 135, i.e., 35 % worse than league average — second‑worst since 1998
- Team bullpen ERA overall: 5.47, one of the poorest in MLB
- In April 2010 alone, bullpen ERA ballooned to around 6.85
Verdict: Historically bad — the worst bullpen in franchise history and among the worst in modern MLB.
2025 Diamondbacks Bullpen (as of mid-season)
- Overall bullpen ERA: 5.31, ranking 28th in MLB
- During May, ERA surged to 6.75, marking their worst month since the 2010 collapse
- Strong early season (April) performance at 3.48 ERA, but regressed greatly after injuries to A.J. Puk and Justin Martinez
- By June, enduring volatility, blown saves and reliable relievers overwhelmed
Verdict: A bullpen that began the season well, but overall has been poor to mediocre — not as historically bad as 2010, but still bottom‑tier in 2025.