Very Early Batted-Ball Trends: A Revolution in Increments?
CLEVELAND — We’re still early in the 2017 season. We should be careful not to make too much of the goings-on of April, of course. I’m aware of all the small-sample-size disclaimers that should be attached to nearly every bit of analysis and assessment at this point. Yet, I still must write and search for things that are interesting. The baseball media industry cannot wait silently at keyboards until sample sizes accumulate and become more meaningful in mid-summer.
Since so much was written about fly-ball philosophy and trends at FanGraphs this offseason and spring — like here and here and here — I thought it would be irresponsible not to check in early (and often) and examine whether we’re were seeing any hints of the revolutionaries growing in number.
Jeff Sullivan identified a slight increase in hitters adopting lift last season. Through two weeks of this season, hitters are producing fewer ground balls and more fly balls.
Through two weeks — that is, through Sunday’s games — major-league hitters combined to produce a 43.5% ground-ball rate collectively, which would mark the lowest ground-ball rate since 2009 (43.3%). The MLB ground-ball rate has stood at 44.4% or greater since 2011, rates perhaps influenced by a greater value placed upon two-seam pitchers, ground balls, and the proliferation of infield defensive shifts.
Fly balls are also up (36.2%) early this season, the highest rate since 2011. It’s an increase of nearly two percentage points from last season (34.6%) and the decade-low rate of 33.8% in 2015. It’s early, but we should also see evidence early if more hitters are trying to lift and drive.
And it’s not just fly balls that should be examined. We should also study Statcast “barrels” and hard-contact rates, as getting on plane with a pitch should result in more quality contact. And the percentage of contact catalogued as “hard” stands at 31.4% early this season, which is tied with last season’s mark and represents the highest mark since 2007 (32%), nearly a 2.5% jump from 2015 and 2014. Uppercut swing advocate J.D. Martinez, for instance, has not dramatically lifted more balls into the air by changing his swing plane, but he has significantly boosted his hard-hit percentage since making his alterations.
These are incremental gains, but string enough incremental gains together and a tipping point is reached. Consider this graph created by my colleague Sean Dolinar:

So perhaps there is a story to be told here — or, at least another chapter of a story to be written.


