Understanding wOBA by Batted-Ball Type

Explore how a hitter's offensive value changes based on whether they hit a ground ball, line drive, or fly ball.

By Garret Merkley · Explainer · Jun 2, 2026

Quick take

wOBA by batted-ball type measures the average offensive value generated from each type of contact.
Line drives consistently produce the highest wOBA, reflecting their high likelihood of becoming hits.
Fly balls can yield high wOBA (home runs) or low wOBA (easy outs), depending on launch angle and exit velocity.
Analyzing this stat helps evaluate a hitter's approach, potential, and ability to make productive contact.

wOBA by batted-ball type is an advanced baseball statistic that breaks down a hitter's Weighted On-base Average (wOBA) based on how they hit the ball. Instead of just looking at a player's overall wOBA, this metric shows the average wOBA generated specifically from ground balls, line drives, fly balls, and sometimes pop-ups, providing a clearer picture of the value created by different kinds of contact.

How Contact Type Shapes Offensive Value

Not all contact is created equal in baseball. A sharply hit line drive, a towering home run, and a weakly hit grounder all leave the bat differently and have vastly different probabilities of becoming hits or outs, and thus different run values. wOBA by batted-ball type quantifies this difference by averaging the wOBA contributions for each instance of a specific batted-ball type.

For example, if a player hits 100 ground balls, the sum of the wOBA values for those 100 plays, divided by 100, gives their wOBA on ground balls. This average reflects the typical outcome and value of that player's ground ball contact. The same calculation applies to line drives, fly balls, and pop-ups.

Typical wOBA Values by Contact Type (General Hierarchy)

Line Drives: Consistently produce the highest wOBA due to their high hit probability.
Fly Balls: Can have a high wOBA (especially home runs) or a very low wOBA (easy outs, depending on trajectory and distance).
Ground Balls: Generally produce a moderate wOBA, often singles, but also prone to double plays.
Pop-ups: Almost always result in outs and thus generate the lowest wOBA values.

Why This Matters for Player Evaluation

Understanding a player's wOBA by batted-ball type offers deep insights into their offensive profile. A hitter might have a decent overall wOBA, but this metric can reveal if they're achieving it by hitting a lot of productive line drives, or by hitting many fly balls that happen to clear the fence, or by beating out many ground balls. It helps evaluators understand a player's approach at the plate and their ability to make productive contact.

For instance, a player with a high ground ball rate might seem less valuable, but if their wOBA on ground balls is significantly higher than league average, it suggests they hit grounders particularly hard, finding holes in the defense more often. Conversely, a player who hits many fly balls with a low average wOBA on those fly balls might be hitting too many easy pop-ups rather than powerful drives. This data helps teams identify areas for improvement, scout talent, and project future performance more accurately.

Is a high ground ball rate always bad?

Not necessarily. While line drives and well-hit fly balls tend to be more valuable on average, a hitter with a high ground ball rate can still be effective if they hit ground balls hard and consistently find gaps, or if they have exceptional speed to beat out infield hits.

What's the ideal batted-ball type distribution?

There's no single ideal distribution, as it depends on the hitter's skills. However, hitters who generate a higher percentage of line drives typically have higher overall wOBAs. Power hitters often aim for a higher fly ball rate to maximize home runs, while contact hitters might prioritize hard ground balls and line drives.

How does this relate to launch angle?

Launch angle is a key determinant of batted-ball type. Low launch angles produce ground balls, mid-range angles produce line drives, and higher angles produce fly balls. Analyzing wOBA by batted-ball type essentially looks at the offensive output resulting from different launch angle ranges.