From Dave Duncan’s Binder to Baseball’s Data Flood

The Cardinal Chronicle
From Dave Duncan’s Binder to Baseball’s Data Flood
St. Louis, MO
By Ray Mileur

There was a time when one of the most powerful pitching tools in baseball was not a camera, a radar unit, a tablet or an algorithm. It was a binder.
A big one.

Dave Duncan, the legendary Cardinals pitching coach, carried his information the old-fashioned way — organized, marked up, worn in and trusted. It was not decorative. It was not for show. It was a working document, the kind of thing a craftsman keeps close because he knows there is no substitute for preparation.

Duncan was known for breaking down opposing hitters in painstaking detail, long before every clubhouse had access to the kind of data that now pours through modern baseball like water through a broken levee.

That binder represented more than notes. It represented a way of thinking.
Duncan did not need to overwhelm a pitcher with everything. His gift was taking information and turning it into a plan a pitcher could actually carry to the mound. Attack this hitter here. Stay away from this zone. Get strike one. Trust the sinker. Make the batter hit your pitch, not his.

That sounds simple. It was not.

The best pitching coaches have always been translators. They take scouting, memory, matchups, mechanics, temperament and game situation, then boil all of it down into something useful. Duncan did that with paper, pencil, experience and a baseball mind sharpened over decades. Sports Illustrated once described the long hours Duncan spent preparing for games and breaking down hitters, the kind of work that helped define his reputation as one of the game’s great pitching minds.

Today, the binder has been replaced by a mountain of data bytes.

Modern pitching coaches have access to information Duncan could only have dreamed about. TrackMan systems provide ball-tracking data in games and practice, offering real-time insight into pitch movement, shape and effectiveness. Hawk-Eye technology now fuels Statcast tracking across Major League Baseball, measuring the game with a level of precision that would have sounded like science fiction not long ago.

Velocity is only the beginning. Pitchers and coaches can now study spin rate, spin axis, vertical break, horizontal movement, release height, extension, approach angle, whiff rates, chase rates, expected damage, heat maps, sequencing patterns and how one pitch plays off another. A pitching coach can know not only that a slider is moving, but whether it is moving the right way, from the right slot, against the right hitter, in the right count.

That is a blessing.

It can also become a burden.

The danger in modern baseball is not a lack of information. The danger is drowning in it. The old binder had limits. Those limits forced clarity. Duncan had to decide what mattered most. Today’s pitching coaches have to do the same thing, only with a fire hose pointed at them.

That is where the old-school lesson still matters.

Data does not coach a pitcher. A person does.

A spreadsheet cannot look into a young pitcher’s eyes after a three-run first inning and know whether he needs a correction, a challenge or a hand on the shoulder. A tablet cannot always tell when a pitcher is scared to throw his best pitch, rushing through his delivery or losing trust in his catcher. Numbers can reveal a problem. They cannot always solve the man.

That is why the great pitching coach in today’s game still has to be part analyst, part teacher, part psychologist and part old-school baseball hand. He has to know what the numbers say, but he also has to know when the pitcher has heard enough.

Duncan’s greatness was never just that he had information. It was that he knew how to use it. He helped pitchers simplify the game without dumbing it down. He gave them plans they could trust. He understood that confidence is often built before the first pitch is thrown.

Modern baseball has changed the binder. It has not changed the job.

The tools are better now. The reports are deeper. The cameras see more. The radar tracks more. The databases remember everything. But when the pitcher stands on the mound with a runner on second, nobody out and the middle of the order coming up, the question is still the same one Duncan’s pitchers faced.
What do we believe in right here?

That is the part no machine can fully answer.

The game has moved from binders to dashboards, from handwritten notes to real-time tracking, from feel alone to feel supported by evidence. That is progress. But the best version of baseball has always lived somewhere between the old and the new.

Dave Duncan’s binder was not primitive. It was foundational.

Today’s pitching coach may carry a tablet instead of a three-ring binder, but the real work remains unchanged.

Study the hitter. Know the pitcher. Build the plan. Earn the trust.

Then let the game decide.

The Cardinal Chronicle, in association with Gateway Sports 
Preserving the Past, Promoting the Present, and Projecting the Future.