A single occurs when a batter hits the ball and reaches first base without the help of an intervening error or attempt to put out another baserunner. Singles are the most common type of hit in baseball, and they occur in many varieties. If a batter beats out a bunt or an infield dribbler -- it's a single. And if a batter hits a rocket to the outfield wall but is held at first base -- it's also a single. (A batter is still credited with a single if he reaches first safely, but is thrown out while trying to advance to second.)
The league's leaders in singles are typically speedy contact hitters who bat higher in the batting order. However, the leaderboard for singles isn't as commonly referenced as the leaderboards for home runs, doubles or triples.
Even though the batter only reaches first base, many singles allow runners to advance two bases. A runner is said to be in "scoring position" when he is on second base (or third base), because he could score on a single to the outfield.
Watch: Xander Bogaerts hits a single.
In A Call
"base hit," "base knock," "one-bagger"