The Astros Have an Outfield Shift
CLEVELAND — We know the Astros are one of the most forward-thinking, analytically minded organizations in baseball. They’ve led baseball in infield shift usage in recent seasons. They’ve experimented with piggy-back rotations in the minor leagues, they’ve been creative in maximizing draft pools, and have given us a revolutionary bullpen figure, the gift that is Chris Devenski.
They’ve also been as aggressive as any team I’ve observed with regard to outfield alignment.
Outfield alignment doesn’t receive as much attention as infield shifts. There are few, if any, outfield alignment measures publicly available, and we don’t often see outfield alignments in full scope on television broadcasts prior to a batted ball. Average depth is recorded by Statcast, but we’re still working on understanding optimum outfield positioning.
But the Astros are up to something — something which I first noticed last season at PNC Park.
Astros with an extreme outfield shift against Polanco pic.twitter.com/Z92F5xyo4j
— Travis Sawchik (@Travis_Sawchik) August 24, 2016
Since air balls are more evenly distributed than ground balls, there are typically fewer radical defensive alignments in the outfield. Since there are only three fielders tasked with covering a much larger area of ground than in the infield, outfielders are generally kept in equidistant positions, spreading risk. But the above alignment against the left-handed-hitting Gregory Polanco represented an extreme swing to the left. It appeared counterintuitive, too, with the Astros playing Polanco as if he were an extreme right-handed pull hitter. In this case, the left fielder was near the left-field line, the center fielder shading toward left center, and the right fielder nearly in right center.
But the approach appears to be rooted in logic, too. While most ground balls are pulled, air balls are more evenly distributed, with batters often slightly favoring the opposite field.