Most statistics describe the game. A rare few quietly rewrite it. The save belongs to that second, more dangerous category: a counting stat, adopted in 1969, that did not merely record how relievers were used but slowly changed how they were used, until the way managers ran their bullpens had reshaped itself around the contours of a number. The ninth inning as we know it — one fresh arm, three outs, a clean slate — is in large part an artifact of how the save was defined.
That is a strong claim for a single stat, so let me be careful about what is well established and what is interpretation. The dates, the rule, and the broad arc of bullpen usage are matters of record. The precise causal weight — how much the save itself drove the change versus how much it rode larger trends in specialization — is a question of judgment, and I will flag it as such. What is not in doubt is that chasing saves and the rise of the rigid one-inning closer happened together, and reinforced each other.
1969: a stat for the unsung reliever
Before 1969, the reliever was a statistical orphan. A pitcher who entered in the ninth to protect a one-run lead and slammed the door got, officially, almost nothing — no win, no meaningful number to show for the highest-pressure work on the field. The starter who had labored eight innings and the reliever who had saved his afternoon were not distinguished by the record book in any way that captured what the reliever had done. The job was real; the credit was missing.
The fix came largely through the advocacy of the Chicago sportswriter Jerome Holtzman, who devised and championed a statistic to formally credit a reliever for finishing a game his team won without surrendering the lead. Major League Baseball adopted the save as an official statistic in 1969, making it the first significant new official stat in decades. The criteria have been tweaked over the years, but the core has held: a reliever earns a save by finishing a won game he did not start, while protecting a lead, under conditions meant to ensure the situation carried genuine difficulty rather than rewarding a mop-up appearance with a huge cushion.
The intent was honorable — give the unsung reliever his due. The unintended consequence is the rest of this article. Once a number existed, it became a thing to accumulate, and things that can be accumulated change the behavior of the people whose jobs are measured by them.
The fireman era: the best arm for the biggest spot
For roughly the first decade-plus after the save’s adoption, the dominant model of relief ace was the fireman, and it looked almost nothing like today’s closer. The fireman was the bullpen’s best pitcher, and he entered the game when the fire was hottest — which often meant the seventh or eighth inning, bases loaded, the game hanging in the balance, not necessarily the tidy start of the ninth. He frequently pitched multiple innings, sometimes recording two or three innings’ worth of outs to escort a lead home. He was deployed by leverage, in the plain-English sense: the manager summoned his best arm for the moment the game was most likely to be decided, whenever that moment arrived.
This is worth dwelling on because it is the road not taken. In usage, the early-save-era ace was closer to what modern analysts would prefer than to what the sport later settled into: his value was concentrated in the highest-stakes innings, whichever they were. A manager of that era would have found it strange to hold his best reliever while the game was lost in the seventh, simply because the ninth had not yet arrived. The save existed, but it had not yet bent usage around itself. That bending was still to come.
The closer hardens: the one-inning, ninth-inning specialist
Across the 1980s and into the 1990s, the fireman gave way to the closer — a narrower, more rigid role defined almost entirely around the save situation. The closer pitched the ninth, usually only the ninth, usually only with a lead of three runs or fewer, and usually only when a save was on the line. The multi-inning escape act faded; the clean one-inning save became the template.
The usage shift is most associated with the Dennis Eckersley–Tony La Russa partnership in Oakland in the late 1980s, which helped formalize and popularize the dedicated one-inning closer — a former starter, repurposed as a ninth-inning finisher, deployed with a regularity that made the role legible and repeatable. The template proved enormously influential, and its later apotheosis was Mariano Rivera, whose long career as a peerless ninth-inning closer became the very picture of the role. By the 1990s the pattern had hardened: nearly every contending team had a designated closer reserved for the ninth, and the save total had become the headline number by which relief aces were judged, paid, and remembered.
How chasing saves bent the bullpen
Here is the mechanism, and here is where I am offering interpretation rather than reciting a rule. Because the save is awarded for finishing the game, and because the save became the currency of relief-pitcher reputation and pay, managers had a powerful incentive to reserve their best reliever for the situation that produces saves — the ninth inning with a lead — even when the genuinely decisive moment of the game arrived an inning or two earlier.
Play it out. It is the eighth, the lead is one run, the bases are loaded, and the heart of the order is due. By any honest reading of when the game will be won or lost, this is the moment for the team’s best arm. But the best arm is the closer, and the closer pitches the ninth — that is his role, and the ninth is where the save lives. So a lesser reliever navigates the eighth-inning minefield while the ace stands in the bullpen waiting for a ninth that may arrive with the lead already surrendered. The save did not order this. But by attaching reputation and reward to a number defined at the end of the game, it nudged a generation of managers toward holding their best reliever for a save situation that is frequently not the highest-leverage one. A counting stat had, in effect, written a usage pattern into the sport — one that often deployed the best arm at less than the biggest moment.
The analytics pushback: back toward leverage
The modern, data-informed objection to the rigid closer is, at bottom, a return to the fireman’s instinct dressed in better math. The argument runs through Win Probability Added and Leverage Index. Leverage Index puts a number on exactly the thing the save ignores — how much a given situation can swing the outcome of the game — with an average moment scaled to 1.0 and the genuine crises rating several times that. By that measure, a bases-loaded, one-run eighth often carries higher leverage than a tidy, nobody-on ninth with the same lead. If the goal is to win games rather than to accumulate saves, the analytics say, you spend your best reliever where the leverage is highest, not where the save rule happens to point.
This is the intellectual engine behind the broader shift in bullpen usage patterns — the willingness, at least at the thoughtful edges of the sport, to bring the best arm into the seventh or eighth for the decisive at-bats, to think in leverage rather than innings, and to treat the ninth as one more spot on the leverage map rather than a sacred preserve. The irony is neat: the cutting-edge prescription closely resembles how relief aces were actually used in the save’s own first decade, before the stat had finished reshaping the role around itself. Whether teams fully act on the logic is a separate matter — the save is deeply embedded in contracts, arbitration, and clubhouse expectation — but the analytical direction is unmistakably back toward leverage.
The bottom line
The save became an official statistic in 1969, championed by Jerome Holtzman to give the unsung reliever the credit the record book had denied him. It succeeded at that — and then did something larger and unintended. Over the following two decades the relief ace evolved from the multi-inning fireman, summoned to the hottest spot whenever it flared, into the rigid one-inning, ninth-inning closer crystallized by the Eckersley–La Russa template and embodied later by Mariano Rivera. Chasing saves nudged managers to hold their best arm for the ninth even when the seventh or eighth was the bigger moment, which is the quiet way a counting stat rewrote how the game is managed. The modern analytics pushback — grounded in Leverage Index and win probability — argues for spending that arm where the game is actually decided, which turns out to look a great deal like the fireman the save helped retire. A single number reshaped a role; it is taking better numbers to reshape it back.
Sources & Further Reading
- SABR — biographical and historical research on Jerome Holtzman, the origin of the save, and the evolution of relief pitching.
- Baseball-Reference — the official save rule, career save records, and reliever usage history.
- FanGraphs — Leverage Index, gmLI, and the analytical case for leverage-based bullpen usage.