Round it! - Data-Driven Baseball5 Baserunning. A deep dive into the data behind baserunning in Baseball5 (en Inglés) - Philip Spielmann

Stop guessing. Start scoring. In the high-speed world of Baseball5, where games are decided in seconds, do you trust your "gut feeling" or the data?

Round it! - Data-Driven Baseball5 Baserunning is the definitive guide for coaches, players, and analysts looking to transform their approach to the basepaths. Written by Philip Spielmann, Head Coach of the Danish National Team and a leading voice in Baseball5 analytics, this book moves beyond traditional wisdom to reveal the hidden math that wins championships.

Most Baseball5 decisions are made based on intuition, but intuition is often wrong. Analyzing nearly 12,000 at-bats from the European Championships and World Cups, Spielmann provides a rigorous, data-backed blueprint for offensive success. This isn't just a book about statistics; it's a manual for building "Baserunning IQ".

Inside the Book:

The 80/50/20 Rule: A practical mental model for aggressiveness. Learn why you need 80% certainty to risk an out with 0 outs, but should gamble with only 20% certainty when there are 2 outs.

The Stalemate Situation: Discover how to exploit the unique dynamics of having runners on first and third to "complicate the defense" and force errors.

Win Probability Matrices: Use the same tools as MLB front offices to understand your odds of winning in any given inning or base-out state.

The Speed Myth: Think the fastest players are always the best baserunners? The data says otherwise. Discover why "Baserunning IQ" and hitting direction (H4) often matter more than a 13-meter sprint time.

Survivorship Bias: Learn how to avoid the common strategic trap of misidentifying what a "scoring position" really is in Baseball5.

Advanced Sabermetrics: The first real application of Run Expectancy (RE24) specifically for the Baseball5 field.

Philip Spielmann is the Head Coach of the Danish National Team, which he led to a 7th-place finish at the 2025 European Championship in their first-ever appearance. A former baseball and softball player turned Baseball5 strategist, Spielmann credits his analytical depth to his unique perspective and obsession with the game's "moving map of shifting probabilities".

Baseball5 is a symbiotic relationship between the person at the plate and the person on the bag. Whether you are a club coach trying to reduce "Left on Base" (LOB) stats or a player wanting to become a more dangerous offensive threat, Round it! gives you the tools to stop playing by chance and start playing by the numbers.

Don't just run because you think you're fast. Run because you've done the math.