Baseball Fly Ball

Baseball Fly Balls

In baseball, a fly ball is a term used to describe a type of batted ball. It is one of three main terms used to describe types of batted balls, with the other two being line drives and ground balls. Below we will cover everything you need to know about fly balls.

What Is a Fly Ball?

A fly ball is when a batter hits the ball high in the air, typically into the outfield. The fielders will run to the ball, attempting to catch it before it hits the ground. If the catch is made, the batter is ruled out. Fly balls are an extremely common way to record outs in baseball, and some pitchers may focus on getting hitters to hit soft fly ball outs. These pitchers are known as fly ball pitchers.

Types of Fly Balls

Fly ball is the basic term to describe any ball hit high in the air. Specific types of fly balls have their own names. The two main types of fly balls are the pop fly and the sacrifice fly.

Pop Fly

A pop fly, also known as a pop-up, goes much higher in the air and travels a shorter distance from home plate. Generally, a fly ball is hit to the outfield, while a pop fly is hit to the infield. Due to this, it is common to see infielders catch pop flies.

Sacrifice Fly

A sacrifice fly is a unique type of fly ball that allows a runner to advance and score from third base by tagging up. The sacrifice fly (often called a “sac fly”) is a huge part of  scoring runs in the MLB. For a sacrifice fly to work effectively, there must be fewer than two outs, and the ball must be hit deep into the outfield.

Fielding Fly Balls

Fielding fly balls is a major part of a defensive player’s job in baseball. To properly field a fly ball, you need to be able to judge a ball's path traveling through the air and run towards the part of the field where it's going to land. Fielders will then want to try to line themselves up so that the ball is right in front of them, allowing them to step forward while they catch the ball and get ready to throw. This will help protect against runners tagging up, and even scoring a run.

Tagging Up

Base runners may try to advance at their own risk whether or not a fly ball is caught. However, if a baseball is caught on the fly, the runner must tag up by touching the base they occupy. Then, they must take off for the next base after the ball has landed in the defender’s glove. It is common to see runners tag up on fly balls that are hit deeper into the outfield.

Foul Fly Balls

Any fly ball that is caught by a fielder in foul territory is not considered a foul ball. Instead, it is considered a fly ball out, and the rules of a normal fly out remain the same. While this can be a benefit to the defending team since they can record outs on foul balls, outfielders still have to keep an eye out for runners tagging up and be ready to throw.

Fly Out

A fly out is a term for when a fly ball is caught by a fielder before hitting the ground, resulting in the batter being ruled out. These do not include balls designated for line drives. Fly outs are a common way for the defense to record outs in baseball.

Infield Fly Rule

The infield fly rule states that if there are runners in force-out positions with less than two outs, any fair fly ball in the infield that is expected to be caught will be automatically ruled an out by the umpire. This rule prevents infielders from purposefully dropping a fly ball to secure more outs. It also protects runners from second-guessing whether to advance or stay back at the base they are occupying.


Can you run on a fly ball in baseball?

Players can choose to run, but if the ball is caught by a fielder, they must return to their base to tag up. If the fielder throws the ball to the base before the runner can return, the runner will be ruled out. Runners should use their judgment when a fly ball is hit.

Can you intentionally drop a fly ball?

If it appears that a fielder intentionally dropped a fly ball, the umpire will use their discretion to rule if it is an out. If a pop fly is hit in the infield and there are runners on base with less than two outs, the infield fly rule will apply. This protects runners from being put out on an intentionally dropped pop fly.