The big Red Sox debate on the talk shows last weekend was the loss of Alex Gonzalez to Toronto. Gonzalez has played very good shortstop for the Red Sox, and, because he’s a lousy hitter, he was signed for cheap by the Blue Jays. Now it turns out, as rumored, that Toronto’s free agent shortstop Marco Scutaro will be Gonzalez’ replacement. As Scutaro is coming off a career year, he is getting more money and an extra year over the journeyman Gonzalez. You can count on extremely negative reaction to the swap. Everyone loves Gonzalez now. Especially his fielding.
What about Scutaro’s fielding? Sox fans don’t know. Neither do I. Almost no one knows.
After some research I’m prepared to say that Gonzalez and Scutaro are both somewhere in the muddy middle of fielders. Gonzalez may be slightly better and he’s certainly more consistent, but it’s hard to make the call. For the record, the best in 2009 was the obscure Jack Wilson. The best this decade was probably the light-hitting Adam Everett. The worst this decade is quite likely Derek Jeter (though he had his best year ever in 2009). This brings up Bill James’ seminal article, Jeter vs. Everett, which could be subtitled “the skeptic looks at fielding.” After reviewing an analysis prepared by John Dewan of Baseball Info Solutions, James writes:
The low defensive rating for Derek Jeter is not based on computers, it is not based on statistics, and it is not based on math. It is based on a specific observation that there are balls going through the shortstop hole against the Yankees that might very well have been fielded.
This type of analysis — in which every play in every game is examined by position — is how hardcore enthusiasts grade fielding. Two statistics that result are plus/minus and zone rating. Plus/minus evaluates how many runs score (or not) based on plays made (or not). Zone rating is a ratio of plays made compared to the number of balls hit in a player’s “zone.”
Baseball Reference provides a plus/minus rating called “Total Fielding Runs Above Average” abbreviated Rtot, or Rtot/yr when divided by 1,250 innings.
FanGraphs provides a zone rating called “Ultimate Zone Rating” abbreviated UZR, or UZR/150 when divided by 150 defensive games.
Two things stand out to me when examining these statistics. The first is that while they roughly track each other, the two ratings don’t always agree — underscoring the difficulty of evaluating fielding. The second is that for individual players, fielding varies as much as batting from year to year, if not more so. Like batting, fielding is affected by injury, age, luck, and intangibles. Everett’s wizardry in 2006 and 2007 was followed by good but not great years in 2008 and 2009. Gonzalez’s UZR/150 since 2002 (not counting 2008 when he did not play) is 10.5, 6.8, 5.0, -2.7, 16.9, 5.9, and 10.5 (for comparison, Everett achieved a high of 29.2 in 2007 and has never been lower than 11.2 as a starter).
In this company, Scutaro appears to be especially erratic. In 2006, when he played 69 games at shortstop for the Athletics, his UZR/150 was negative 28.1. Two years later, when he played 56 games at shortstop for the Blue Jays, his UZR/150 was positive 20.3. Arguably the fact that he played multiple positions every season before 2009 could be a factor — perhaps cutting into his practice and certainly lowering the sample sizes. His actual capability as a shortstop may best be reflected by his 2009 season, when he played 143 games at shortstop and achieved a UZR/150 of 1.0. In lifetime numbers, Scutaro ends up as an average fielder at shortstop with a UZR/150 of -2.9 (he is average or worse at second and third base as well).
Gonzalez seems to be a more consistent fielder than Scutaro, but he may not be a better fielder. Certainly, it’s impossible to say who will be better in 2010. Yet Red Sox fans will continue to remember Gonzalez fondly, not least because his best year as a fielder, in 2006, just happened to be for the Boston club.
A summary of findings:
| Player |
Rtot/yr (2008) |
Rtot/yr (2009) |
Rtot/yr (Career) |
UZR/150 (2008) |
UZR/150 (2009) |
UZR/150 (Career) |
| Adam Everett |
-2.6 |
9.8 |
13.9 |
11.2 |
13.6 |
18.3 |
| Jack Wilson |
20.3 |
15.6 |
7.9 |
16.7 |
20.4 |
5.9 |
| Derek Jeter |
-8.0 |
3.6 |
-7.7 |
-0.7 |
8.4 |
-4.6 |
| Alex Gonzalez |
DNP |
-0.4 |
-1.3 |
DNP |
10.5 |
6.9 |
| Marco Scutaro |
29.7 |
13.4 |
5.4 |
20.3 |
1.0 |
-2.9 |
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