Traditionally, statistics like batting average for batters—the number of hits divided by the number of at bats—and earned run average—approximately the number of runs given up by a pitcher per nine innings—have governed the statistical world of baseball. However, the advent of sabermetrics has brought an onslaught of new statistics that better gauge a player's performance and contributions to his team from year to year.

Some sabermetrics have entered the mainstream baseball statistic world. On-base plus slugging (OPS) is a somewhat complicated formula that gauges a hitter's performance better than batting average. It combines the hitter's on base percentage—hits plus walks plus times hit by pitches divided by plate appearances—with their slugging percentage—total bases divided by at bats. Walks plus hits per inning pitched (or WHIP) gives a good representation of a pitcher's abilities; it is calculated exactly as its name suggests.

Also important are more specific statistics for a certain situation. For example, a certain hitter's ability to hit left-handed pitchers might cause his manager to give him more chances to face lefties. Some hitters hit better with runners in scoring position, so an opposing manager, knowing this statistic, might elect to intentionally walk him in order to face a poorer hitter.