What Do LRP and MRP Mean in Baseball?

Each type of pitcher plays a critical role. Both LRP and MRPs can make or break your team.
Written by Mark Bailey
Last updated on

In baseball, “LRP” stands for Long Relief Pitcher and “MRP” stands for Middle Relief Pitcher. An LRP is typically used when a starting pitcher is pulled from the game early and can pitch several innings if necessary. An MRP usually pitches in the middle innings, before the setup man and closer, and may be used to face a specific part of the batting order or to bridge the gap to the late-inning relievers.

  • Baseball teams require a variety of specialists, including long relief pitchers (LRP) and middle relief pitchers (MRP).
  • LRP are often former starters that can pitch anywhere from an inning to nine. They help the team get through games when the starter is injured or has given up many runs in one inning.
  • MRP usually appears for 1-4 innings and acts as a bridge between the starter and the closer. Their job is to hold leads and ties or keep games close so that the back end of the bullpen can be effective.
  • The strategy used by managers will determine which types of pitchers they use; sometimes, sacrificing one game may bolster their arms for future series.

Long Relief Pitchers  (LRP)

LRP stands for long relief pitchers in baseball.

Long-relief pitchers are often former starters that have been moved to the bullpen. A LRP could pitch anywhere from an inning to possibly nine. They are able to eat a lot of innings in a game so that you don’t have to use too many pitchers in a game.

For example, let’s say that you have a starter that pulls a muscle in the first inning. You don’t want to have to use your entire bullpen in order to get through the game. You would use a long relief pitcher to eat as many innings as possible to keep the game close. 

Another example of this would be if your starting pitcher gave up a large number of runs in the first inning. If you are down by a substantial number of runs and your offense is not scoring, the last thing you want to do is burn through your arms just to get through the game.

A long relief pitcher may be inserted. If the other team’s offense is still hot, that long relief pitcher may just remain in the game until they hit their pitch count. 

In these cases, you may even see some position players who were former pitchers take the mound. It doesn’t happen often, but every now and again, you get to see an outfielder take the mound and essentially lob pitches across the plate to get the team out of the inning and save the arms in the bullpen. Sometimes this strategy works because the pitches are generally significantly slower than the average pitcher, and major league batters have a hard time adjusting to the difference. 

Another reason why you may need to use a long relief pitcher is that your starter got thrown out of the game. Again, it is not common, but this is a circumstance where you essentially need a starter to replace a starter. 

Long-relief pitchers are generally not used in back-to-back games. If they throw a lot of pitches, they may not be available for a few days after their appearance.

Can long relief pitchers be used in shorter appearances? Yes. If needed, long relief pitchers can be used for a short appearance in a game. For example, if a game is tied and goes into extra innings, you may need to use a long relief pitcher to get to your closer.

Some extra innings games only last an inning. Some can stretch into what is essentially a doubleheader. This is rare but does happen from time to time. 

Another situation to consider is the game after an extra-inning game. If you used a number of pitchers in your bullpen, you might be short-staffed while those pitchers recover from extensive work. This is another scenario where your long relief pitchers may come into play. 

Middle Relief Pitchers (MRP)

MRP in baseball stands for middle relief pitchers.

Middle Relief Pitchers are more common to see in a game. Middle relief pitchers may make appearances anywhere from 1 to 4 innings. They will most likely appear for an inning or two but can stretch a little longer if needed. 

You will most likely see a MRP when a starter throws a lot of pitches early and hits a pitch count early in the game. For example, if a starter has a rough first inning or second inning where they throw a lot of pitches, that will likely make their appearance shorter.

The middle relief pitcher acts as a bridge between the starter and the closer. A middle relief pitcher’s job is generally to hold a lead, tie, or keep the game close. They enable the back end of the bullpen to be effective. 

Why relievers? 

Baseball has changed over the years. In the early days, the starting pitchers would pitch close to complete games. Pitchers threw longer and more pitches.

In the modern era, starting pitchers are not expected to throw as deep into a game. Bullpens are full of long and short relievers to help get through a line-up. If a starter can deliver a strong 6 to 7 innings, the bullpen is often capable of closing out the game. The question is, which pitcher do you use and when? 

The reason for relief 

One of the biggest deciding factors in choosing a reliever is when the reliever is expected to go into the game. There are a number of reasons why relievers are needed.

You may have a starting pitcher who gets injured early in the game. You may have a pitcher who simply has a poor outing. You may have a pitcher who is returning from injury. Or you may have a pitcher who has simply hit their pitch count limit for that game.

In addition, you may find that you need to replace a pitcher for a strategic reason – maybe a pinch hitter has been entered who has had great success against your pitcher. There are many reasons why you would replace a pitcher; the next question is, who do you use in their place? 

Managing pitchers is an art

The strategy will determine what types of pitchers you will use in a game. As a manager, sometimes you have to make a decision between trying to win the game and preserving your arms so that you can win the series.

In some cases, managers will sacrifice a game a burn a long relief pitcher in order to bolster their bullpen for the rest of the series. Middle relief pitchers and long relief pitchers have a multitude of purposes, but it always comes down to your coaching philosophy and the circumstances of the game.