Introduction
Sunday night baseball is such a great thing. Yes, I may fall asleep around the 6th or 7th, but I fall asleep to baseball, which is nice. It's such a summer feeling for me to have the window open, the summer breeze blowing in and talk of baseball in the background. Last night, the Cubs were aggressive early on the base paths. At one point, with Schwarber on first and Bryant at the plate, Bryant hits what would typically be a routine single to left-center. Now, with the Cardinals and the Cubs fighting it out for the top spot in the division, you'll see an aggressive approach by Schwarber. Did master mind Joe Maddon have that all planned and ready? Did he tell his team to run on Ozuna? Well, if so, maybe he (or his team of data scientists and analysts) was evaluating the rARM statistic.
Part 1: The Stat - Throwing Arm Runs Saved
A player's total Throwing Arm Runs Saved is then the sum of our three halves: flyballs Runs Saved + groundballs Runs Saved + Miscellaneous Kills Runs Saved.
- The Fielding Bible After researching the Ozuna question and trying to find the statistic that would best explain the decision to run or not to run, I settled on the Throwing Arm Runs Saved statistic and it's detailed approach to quantifying an outfielder's ability to hold runners on base. A very detailed overview of this statistic can be found here. But, I'll do my best to break it down: The Three Categories: The statistic is built around three categories in which each one counts: 1. When a runner moves an extra base. For example, when a runner advances from first to third on a single just like in the case of Schwarber and Ozuna. This is known as "Moved" 2. When a runner does not move an extra base. This would have been the case if Schwarber stayed at second or when a player simple goes from "station to station". This is known as "Did Not Move" 3. When a runner gets thrown out trying to take the extra base. This is known as "Thrown Out" The Calculation Each fielding position (infield and outfield) is broken down into zones or buckets, which take into consideration where the ball landed or where the play was made. For each of these positions and for each of the instances above, percentages are calculated. So, for example, the percentage of times the ball is hit left-center of Ozuna and a runner takes the extra base, or is "Moved." (1) Fly Ball Arm Runs Saved League Average: Percentages of "Moved", "Did Not Move" and "Thrown Out" for each zone, at each position, for each situation. Opportunities: # of times runners move on a player + # of times runners don't move on a player + # of throw outs Expected Runs Saved: opportunities x the league average The difference between expected and actual x the run value of each play (2) Repeat above calculation for Ground Balls Runs Saved (3) Miscellaneous Kills Calculate the league average: Take the number of miscellaneous kills per touch (the sum of miscellaneous kills / total number of touches) Calculate expected miscellaneous kills: Multiply league average by the player's touches The difference in expected and actual x run value Outfield Throwing Arm Runs Saved: (1) Fly ball arm runs saved + (2) ground ball arm runs saved + (3) miscellaneous kills Part 2: The Arm of Ozuna
With this complicated and in-depth defensive metric, the real question is a two parter:
(1) Are the Cubs using such a statistic to run on Ozuna? (2) Who are the people actually calculating this metric? Like, actually measuring the percentages in each zone? That's crazy!
Let's see how Ozuna stacks up:
Looking at the first chart on the left, we see that Ozuna shows up just above the league average (indicated by the horizontal line) We also see no Ozuna in seasons 2018 (middle chart) and 2019 (right chart) So, clearly teams can feel like it is worth the risk to run on Marcell in this current season. Here's the top 30 left fielder's as measure by the rARM stat in the past three seasons.
Interestingly enough, Ozuna shows up in the top 30 twice, once in the 2017 season and once again in the current 2019 season, just above the league average of 0.5. A second interesting piece is that the runner who took that extra base was Kyle Schwarber, who's 2018 season had him as the 2nd highest rARM stat in the past three seasons and this season (2019), he's above average. This may just suggest that when a left fielder is sizing up another left fielder, there may be more of a reason to run and show a more aggressive approach.
Did the first base (or possibly third base) coach take all these factors into consideration? Maybe. But, maybe not. Maybe Schwarber just had an extra cup of coffee that day. The point is, you can run on Ozuna, but beware, he is above the league average this season for the rARM stat.
References:
https://sabr.org/research/measuring-defense-entering-zones-fielding-statistics http://www.fieldingbible.com/methodology-ofarms.asp https://www.fangraphs.com/leaders.aspx?pos=lf&stats=fld&lg=all&qual=y&type=1&season=2019&month=0&season1=2016&ind=1&team=0&rost=0&age=0&filter=&players=0&startdate=2016-01-01&enddate=2019-12-31&sort=10,d https://library.fangraphs.com/defense/drs/
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