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These are some baseball terms starting with the letter R. It will be updated from time to time.
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'R' Baseball Terminology

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Baseball TermDescription
RelieverCan be used to identify a pitcher who enters the game and who did not start the game as pitcher for his team. It can also be used to identify a pitcher's role. He is a reliever because he generally does not start the game.
Road TripWhen a team leaves their home city to play games in other cities, it is considered a road trip though the word may be more apt for multiple series away from home consecutively.
RookieThough there are numerical definitions for a rookie depending on his playing time, the term rookie is usually reserved in all levels for a player who is playing his first full season with a team.
Rosin BagA small bag filled with rosin powder that is left near the pitching mound and used by pitchers to help them get a better grip on the ball
Rounding a BaseA runner will often run past a base with a few more steps to survey the situation before deciding to stay at that base. The idea being that if a ball is booted or a throw is offline, he can take the extra base
Route EfficiencyDetermines the efficiency that an outfielder used to get to a flyball based on the player's starting point and the eventual landing point of the ball.
Rubber GameFor a 3 game series, the last game of a tied series that will eventually decide who wins the series.
Rule 5 DraftSpecial draft at the winter meetings where teams are free to draft players unprotected on the 40-man roster who have incurred enough minor league service time to have the right to be drafted. If drafted, players are required to stay on the team's 25-man Roster all season or else be offered back to their original team
Run DownA runner who gets caught between 2 bases with fielders throwing the ball back and forth to try to get him out is in a Run Down. He will most likely be out.
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