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About John Walsh

John Walsh is a research physicist who, despite living 4000 miles from Fenway Park, remains an avid fan of the Red Sox. He welcomes questions and comments via e-mail.


Choose year:  2008  2007  2006  2005  2004

John Walsh's Articles

2007

Fastball, slider, change-up, curveball—an analysis

December 20, 2007
Analysis of the four workhorses of the pitcher's arsenal: fastball, slider, change-up and curveball.

Butterflies are not bullets

November 27, 2007
John tries to pin down the elusive knuckler using Pitch f/x data.

The advantage of batting left-handed

November 15, 2007
Left-handed batters on average hit for higher averages than right handers. The reasons for that may surprise you.

Don’t blame Pedro

November 01, 2007
An investigation of Pedro Martinez in 2007.


Pitch Identification Tutorial

September 19, 2007
Everything you need to know about identifying pitches using pitch-f/x data.

Squaring it up

September 04, 2007
Is it better to swing at a strike than a ball? Yes. How much better? A lot.

The eye of the umpire

July 25, 2007
John investigates the accuracy of umpires' eyes. He employs a million-dollar pitch-tracking system instead of an eye-chart.

Strike Zone: Fact vs. Fiction

July 11, 2007
Did you know that right-handed batters have to defend a bigger strike zone than lefties?

Schilling’s aching shoulder

June 26, 2007
Another use for detailed pitch data: investigating the ailing shoulder of Curt Schilling.

In Search of the Sinker

June 06, 2007
John shows how you can identify different pitch types using data from MLB's Enhanced Gameday. He then digs deeper into the sinker and wonders how anybody can throw the pitch.

Infield Defense, Part 2 — The Next Step

May 24, 2007
Not all ground balls are created equal.

Infield Defense — Back to Basics

May 09, 2007
All these defensive systems making your head spin? John looks at infield defense in a simpler way.

Going the Other Way

April 24, 2007
John looks at the history of hitting to the opposite field. Are hitters using the opposite field more now than in the past?

Five Questions: New York Mets

March 28, 2007
Thoughts on the Mets winning another division title in 2007. Or not.

Boston’s Most Wanted

February 28, 2007
John Walsh tells us which batters would benefit most from a move to Fenway Park.

Best Outfield Arms of 2006

February 15, 2007
The best and worst outfield arms of 2006.

Making the Most of Fenway Park

January 25, 2007
A look at who benefits from the Green Monster and who doesn't.

Americans Defeat Nationals in Pitchers’ Duel

January 11, 2007
The American League is becoming the premier league in MLB. Not only for its hitters, but it turns out AL pitchers are superior as well.


We Blew It

January 03, 2007
A look back at the Soriano-Wilkerson trade.


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