As noted in his post, a 'keeper's role in terms of passing is completely different from the outfield players but when put up against others in the same position you can find some interesting callouts, if not meaningful. Here are three points:
1. CONNECTING LONG BALLS
Perhaps it is the English in me but the first thing I looked at was how well goalkeepers connected on their long ball attempts. The theory is that if teams are successful in that then they probably score more. This thinking goes way back to Charles Reep was a RAF Wing Commander who wrote about “long ball theory" during the middle part of the last century. Boiled down; Reep believed there was an association between fewer passes and goals.
While most these days will tell you that just booting it down field is the wrong thing to do, you’ll see in the data that most MLS teams love to put it up for grabs (surprising note; it happens more often in the Premier League).
Team PPG : Descriptor
1.44 : GOOD Long Ball Passing % (Top 6)
1.35 : BAD Long Ball Passing % (Bottom 6)
Goals For per Game : Descriptor
1.33 : GOOD Long Ball Passing % (Top 6)
1.33 : BAD Long Ball Passing % (Bottom 6)
Predictably, a team that has a keeper with decent long ball distribution does better but what was sort of a surprise was goals for per game. The same? Where were the better results coming from then? Let’s take a look...
Goals Against per Game : Descriptor
1.19 : GOOD Long Ball Passing % (Top 6)
1.39 : BAD Long Ball Passing % (Bottom 6)
That is a significant difference. Having a ‘keeper with smart long ball distribution might not get you more goals but this does suggest that it helps keep the goals against rate down. By a large margin. Makes sense.
2. SHORT PASSING COMPLETION
What is odd about looking at short passing % is that teams with lower completion rates did measurably better, which is counter intuitive. At first...
Team PPG : Descriptor
1.24 : GOOD Short Ball Passing % (Top 6)
1.54 : BAD Short Ball Passing % (Bottom 6)
Goal Diff : Descriptor
-0.08 : GOOD Short Ball Passing % (Top 6)
+0.19 : BAD Short Ball Passing % (Bottom 6)
That was confusing to me so I looked at how often the teams were passing short. The bottom group was playing possession more out of the back, on average, than the top group. So naturally their percentage was lower.
Also, two of the top short passing percentages were DC and Toronto FC which are driving the results into the abyss.
3. PLAY POSSESSION. PASS SHORT.
The odd results in short passing lead me to looking at what goalies liked to do and not at completion percentage. Here is where I found that teams that play it short out of the back do better.
Teasing out teams/goalies that play the ball long most of the time is probably the most telling. Here are the teams who play over 80% long ball from the keeper position.
% of time Long Ball played : Team
85.1 : Toronto FC
84.5 : Colorado Rapids
84.1 : Columbus Crew
80.1 : San Jose Earthquakes
...and here are the teams who play the long ball least
58.4 : Real Salt Lake
60.8 : Sporting KC
63.2 : Los Angeles
64.8 : Montreal Impact
Of the four above you have the two teams who are currently have a legitimate shot at the Supporters’ Shield (RSL and Montreal).
A little bit further down the list but still playing short you have New York, Seattle, New England and Portland. The commonality here is playoff caliber teams.
Team PPG : Descriptor
1.63 : Play the ball short (<70% of the time)
1.10 : Play the ball long (>80% of the time)
Goal Difference per Game
+0.32 : Play the ball short (lowest 6 teams)
-0.22 : Play the ball long (>80% of the time)
FINAL THOUGHTS, RELATIONSHIP
It can be a little dangerous to pull out a few things like this and draw big conclusions but I do believe it is safe to say that playing possession out of the goalkeeper position is the right thing to do in Major League Soccer and if you are playing it long you best have a good distributor.
Some out there might be shaking their heads and saying ‘of course it is’ but spending a little bit of time with goalie distribution you see that there are still a lot of clubs that don’t subscribe to that theory (again, check Tempo-Free Soccer’s site for EPL data).
So, the data is here to support a closer look at playing short out of the goalkeeper position. How often and under what circumstances would be the next questions that might need to be answered but there is enough here to determine there is a relationship worth exploring.
Thanks for reading.
The Columbus Crew’s GK, Andy Gruenebaum, plays the ball deep more than 16 other MLS teams with an average pass completion percentage (both long and short).